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Equity Investments (Narrative) (Details) (USD $)
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3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | ||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2013
acre
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Mar. 31, 2012
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Dec. 31, 2012
acre
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Mar. 31, 2013
Tatex Thailand II, LLC [Member]
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Dec. 31, 2012
Tatex Thailand II, LLC [Member]
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Dec. 31, 2011
Tatex Thailand II, LLC [Member]
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Mar. 31, 2013
Apico Llc [Member]
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Dec. 31, 2012
Apico Llc [Member]
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Mar. 31, 2013
Tatex Thailand III, LLC [Member]
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Dec. 31, 2012
Tatex Thailand III, LLC [Member]
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Dec. 31, 2011
Tatex Thailand III, LLC [Member]
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Dec. 31, 2010
Tatex Thailand III, LLC [Member]
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Apr. 01, 2010
Grizzly Oil Sands ULC [Member]
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Jan. 01, 2008
Grizzly Oil Sands ULC [Member]
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Mar. 31, 2013
Grizzly Oil Sands ULC [Member]
acre
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Mar. 31, 2012
Grizzly Oil Sands ULC [Member]
acre
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Dec. 31, 2012
Grizzly Oil Sands ULC [Member]
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Dec. 31, 2011
Grizzly Oil Sands ULC [Member]
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Dec. 31, 2010
Grizzly Oil Sands ULC [Member]
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Dec. 07, 2011
Grizzly Oil Sands ULC [Member]
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May 15, 2012
Bison Drilling And Field Services LLC [Member]
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Apr. 30, 2012
Bison Drilling And Field Services LLC [Member]
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Mar. 31, 2013
Bison Drilling And Field Services LLC [Member]
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Sep. 30, 2011
Bison Drilling And Field Services LLC [Member]
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Sep. 30, 2012
Bison Drilling And Field Services LLC [Member]
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Dec. 31, 2012
Bison Drilling And Field Services LLC [Member]
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Dec. 31, 2011
Bison Drilling And Field Services LLC [Member]
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May 15, 2012
Bison Drilling And Field Services LLC [Member]
Minimum [Member]
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May 15, 2012
Bison Drilling And Field Services LLC [Member]
Maximum [Member]
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Mar. 31, 2013
Muskie Holdings LLC [Member]
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Dec. 31, 2011
Muskie Holdings LLC [Member]
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Dec. 31, 2012
Muskie Holdings LLC [Member]
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Mar. 31, 2012
Timber Wolf Terminals LLC [Member]
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Dec. 31, 2012
Timber Wolf Terminals LLC [Member]
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Mar. 31, 2013
Timber Wolf Terminals LLC [Member]
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Dec. 31, 2011
Timber Wolf Terminals LLC [Member]
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Mar. 31, 2013
Windsor Midstream LLC [Member]
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Mar. 31, 2012
Windsor Midstream LLC [Member]
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Dec. 31, 2012
Windsor Midstream LLC [Member]
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Dec. 31, 2011
Windsor Midstream LLC [Member]
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Mar. 31, 2013
Windsor Midstream LLC [Member]
MidMar Gas LLC [Member]
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Dec. 31, 2012
Windsor Midstream LLC [Member]
MidMar Gas LLC [Member]
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Mar. 31, 2013
Stingray Pressure Pumping LLC [Member]
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Dec. 31, 2012
Stingray Pressure Pumping LLC [Member]
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Jun. 30, 2012
Stingray Pressure Pumping LLC [Member]
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Dec. 31, 2011
Stingray Pressure Pumping LLC [Member]
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Mar. 31, 2013
Stingray Cementing LLC [Member]
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Dec. 31, 2012
Stingray Cementing LLC [Member]
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Jun. 30, 2012
Stingray Cementing LLC [Member]
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Dec. 31, 2011
Stingray Cementing LLC [Member]
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Dec. 31, 2012
Blackhawk Midstream LLC [Member]
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Mar. 31, 2013
Blackhawk Midstream LLC [Member]
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Jun. 30, 2012
Blackhawk Midstream LLC [Member]
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Dec. 31, 2011
Blackhawk Midstream LLC [Member]
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Dec. 31, 2012
Stingray Logistics LLC [Member]
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Mar. 31, 2013
Stingray Logistics LLC [Member]
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Jun. 30, 2012
Stingray Logistics LLC [Member]
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Dec. 31, 2011
Stingray Logistics LLC [Member]
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Mar. 31, 2013
Diamondback Energy LLC [Member]
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Dec. 31, 2012
Diamondback Energy LLC [Member]
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Dec. 17, 2012
Diamondback Energy LLC [Member]
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Oct. 11, 2012
Diamondback Energy LLC [Member]
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Jun. 30, 2012
Diamondback Energy LLC [Member]
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Dec. 31, 2011
Diamondback Energy LLC [Member]
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Mar. 31, 2013
Stingray Energy Services LLC [Member]
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Dec. 31, 2012
Stingray Energy Services LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ownership interest | 23.50% | 23.50% | 17.90% | 17.90% | 24.9999% | 24.9999% | 15.00% | 40.00% | 25.00% | 40.00% | 25.00% | 50.00% | 22.50% | 28.40% | 28.40% | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% | 21.40% | 50.00% | |||||||||||||||||||||||||||||||||||||||||||||||
| Equity shares owned by affiliate (shares) | 85,122 | 85,122 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Total shares owned of subaffiliate (shares) | 1,000,000 | 1,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Gas and oil area, reserve (acres) | 243,000 | 243,000 | 800,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Distributions received | $ 188,000 | $ 200,000 | $ 820,000 | $ 870,000 | $ 565,000 | $ 200,000 | $ 820,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity investments | 451,592,000 | 381,484,000 | 86,824,000 | 15,000 | 203,000 | 1,030,000 | 8,639,000 | 8,657,000 | 8,282,000 | 176,196,000 | 172,766,000 | 69,008,000 | 13,988,000 | 13,518,000 | 6,366,000 | 7,702,000 | 2,138,000 | 7,320,000 | 878,000 | 870,000 | 9,887,000 | 9,503,000 | 15,718,000 | 13,265,000 | 3,088,000 | 3,110,000 | 0 | 0 | 0 | 947,000 | 928,000 | 0 | 212,413,000 | 151,317,000 | 138,496,000 | 0 | 2,148,000 | 0 | |||||||||||||||||||||||||||||||
| Equity method investment, percentage of remaining interest | 68.70% | 68.70% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amount of cash calls, proportionately based | 0 | 626,000 | 7,500,000 | 103,915,000 | 300,000 | 1,373,000 | 800,000 | 6,213,000 | 0 | 1,819,000 | 1,800,000 | 14,500,000 | 0 | 3,269,000 | 436,000 | 983,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| (Income) loss from equity method investments | 61,210,000 | (268,000) | 8,322,000 | (1,418,000) | (977,000) | (251,000) | (172,000) | (224,000) | (500,000) | (300,000) | (1,512,000) | (1,592,000) | (740,000) | (100,000) | (373,000) | 357,000 | (400,000) | (1,031,000) | (122,000) | 400,000 | 100,000 | 663,000 | (700,000) | (1,235,000) | (159,000) | (436,000) | (36,000) | 61,100,000 | 12,821,000 | ||||||||||||||||||||||||||||||||||||||||
| Gas and oil areage, undeveloped, gross (acres) | 47,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Increase (decrease) due to foreign currency translation adjusment | (3,600,000) | 900,000 | 1,355,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loans receivable, description of variable rate basis | LIBOR | LIBOR | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Basis spread on loan receivable | 4.00% | 0.28% | 8.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt instrument, maturity date | Dec. 31, 2011 | Dec. 31, 2012 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loans receivable, fixed interest rate | 0.69% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Origination of notes receivable from related parties | 0 | 3,182,000 | 2,877,000 | 3,182,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest income | 79,000 | 27,000 | 72,000 | 186,000 | 387,000 | 147,000 | 267,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Payments for equity method investments | 12,653,000 | 75,879,000 | 147,307,000 | 34,621,000 | 1,244,000 | 6,152,000 | 6,009,000 | 2,142,000 | 1,000,000 | 7,021,000 | 2,200,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amount Loaned During Period | 1,594,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Currency transaction loss in note receivable | (2,442,000) | (1,087,000) | (2,952,000) | (696,000) | 75,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment (shares) | 7,914,036 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Promissory note receivable | 63,600,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Share price (usd per share) | $ 26.84 | $ 19.12 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Increase in equity method investment | $ 22,325,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||