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Equity Investments (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | |||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
acre
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Jun. 30, 2012
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Dec. 31, 2012
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Jun. 30, 2013
Tatex Thailand II, LLC [Member]
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Jun. 30, 2013
Tatex Thailand II, LLC [Member]
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Dec. 31, 2012
Tatex Thailand II, LLC [Member]
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Jun. 30, 2013
Apico Llc [Member]
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Jun. 30, 2013
Tatex Thailand III, LLC [Member]
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Jun. 30, 2013
Tatex Thailand III, LLC [Member]
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Jun. 30, 2012
Tatex Thailand III, LLC [Member]
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Dec. 31, 2012
Tatex Thailand III, LLC [Member]
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Jun. 30, 2013
Grizzly Oil Sands ULC [Member]
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Jun. 30, 2012
Grizzly Oil Sands ULC [Member]
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Jun. 30, 2013
Grizzly Oil Sands ULC [Member]
acre
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Jun. 30, 2012
Grizzly Oil Sands ULC [Member]
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Dec. 31, 2012
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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Jun. 30, 2013
Bison Drilling And Field Services LLC [Member]
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Jun. 30, 2012
Bison Drilling And Field Services LLC [Member]
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Jun. 30, 2013
Bison Drilling And Field Services LLC [Member]
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Jun. 30, 2012
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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Sep. 30, 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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Jun. 30, 2013
Muskie Holdings LLC [Member]
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Jun. 30, 2012
Muskie Holdings LLC [Member]
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Jun. 30, 2013
Muskie Holdings LLC [Member]
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Jun. 30, 2012
Muskie Holdings LLC [Member]
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Dec. 31, 2012
Muskie Holdings LLC [Member]
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Dec. 31, 2011
Muskie Holdings LLC [Member]
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Jun. 30, 2012
Timber Wolf Terminals LLC [Member]
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Jun. 30, 2013
Timber Wolf Terminals LLC [Member]
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Dec. 31, 2012
Timber Wolf Terminals LLC [Member]
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Jun. 30, 2013
Windsor Midstream LLC [Member]
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Jun. 30, 2012
Windsor Midstream LLC [Member]
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Mar. 31, 2012
Windsor Midstream LLC [Member]
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Jun. 30, 2013
Windsor Midstream LLC [Member]
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Jun. 30, 2012
Windsor Midstream LLC [Member]
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Dec. 31, 2012
Windsor Midstream LLC [Member]
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Jun. 30, 2013
Windsor Midstream LLC [Member]
MidMar Gas LLC [Member]
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Jun. 30, 2013
Stingray Pressure Pumping LLC [Member]
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Jun. 30, 2012
Stingray Pressure Pumping LLC [Member]
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Jun. 30, 2013
Stingray Pressure Pumping LLC [Member]
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Jun. 30, 2012
Stingray Pressure Pumping LLC [Member]
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Dec. 31, 2012
Stingray Pressure Pumping LLC [Member]
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Jun. 30, 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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Jun. 30, 2013
Blackhawk Midstream LLC [Member]
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Jun. 30, 2012
Blackhawk Midstream LLC [Member]
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Jun. 30, 2013
Blackhawk Midstream LLC [Member]
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Jun. 30, 2012
Blackhawk Midstream LLC [Member]
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Dec. 31, 2012
Blackhawk Midstream LLC [Member]
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Jun. 30, 2013
Stingray Logistics LLC [Member]
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Dec. 31, 2012
Stingray Logistics LLC [Member]
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Jun. 24, 2013
Diamondback Energy LLC [Member]
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Jun. 30, 2013
Diamondback Energy LLC [Member]
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Jun. 30, 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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Jun. 30, 2013
Stingray Energy Services LLC [Member]
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Mar. 31, 2013
Stingray Energy Services LLC [Member]
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Jun. 30, 2013
Stingray Energy Services LLC [Member]
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Dec. 31, 2012
Stingray Energy Services LLC [Member]
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Jul. 05, 2013
Subsequent Event [Member]
Diamondback Energy 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% | 40.00% | 40.00% | 25.00% | 25.00% | 50.00% | 22.50% | 22.50% | 28.40% | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% | 13.50% | 13.50% | 21.40% | 50.00% | 50.00% | |||||||||||||||||||||||||||||||||||||||||||||||
| Equity shares owned by affiliate (shares) | 85,122 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Total shares owned of subaffiliate (shares) | 1,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Gas and oil area, reserve (acres) | 243,000 | 800,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Distributions received | $ 901,000 | $ 200,000 | $ 200,000 | $ 400,000 | $ 698,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity method investment, percentage of remaining interest | 68.70% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity investments | 438,864,000 | 438,864,000 | 381,484,000 | 203,000 | 9,138,000 | 9,138,000 | 8,657,000 | 176,876,000 | 176,876,000 | 172,766,000 | 13,816,000 | 13,816,000 | 13,518,000 | 8,453,000 | 8,453,000 | 7,320,000 | 870,000 | 878,000 | 9,664,000 | 9,664,000 | 9,503,000 | 15,399,000 | 15,399,000 | 13,265,000 | 3,041,000 | 3,110,000 | 0 | 0 | 0 | 900,000 | 947,000 | 198,662,000 | 198,662,000 | 151,317,000 | 138,500,000 | 2,045,000 | 2,045,000 | 0 | ||||||||||||||||||||||||||||||||||
| Sale of Stock, Price Per Share | $ 34.75 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (Income) loss from equity method investments | 50,108,000 | (360,000) | 111,318,000 | (628,000) | 200,000 | 200,000 | 100,000 | 100,000 | 100,000 | (800,000) | (300,000) | (1,300,000) | (600,000) | 200,000 | 300,000 | 300,000 | (400,000) | (100,000) | (800,000) | (100,000) | 474,000 | 59,000 | 858,000 | 115,000 | 319,000 | 100,000 | (400,000) | 100,000 | 69,000.00 | 100,000 | 200,000 | 100,000 | 200,000 | 100,000 | 51,400,000 | 112,500,000 | 103,000 | 138,000 | ||||||||||||||||||||||||||||||||||
| Cash calls paid | 600,000 | 15,100,000 | 300,000 | 1,900,000 | 1,800,000 | 100,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Increase (decrease) due to foreign currency translation adjustment | (6,100,000) | (2,900,000) | (9,700,000) | (1,900,000) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shares sold | 1,951,781 | 282,755 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net sales proceeds | (65,111,000) | 0 | 65,100,000 | 9,400,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loans receivable, description of variable rate basis | LIBOR | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loans receivable, basis spread on variable rate | 0.28% | 8.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Payments for equity method investments | 21,960,000 | 101,864,000 | 6,200,000 | 1,000,000 | 7,000,000 | 2,200,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amount loaned during period | 1,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment (shares) | 7,914,036 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Promissory note receivable | $ 63,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Share price (usd per share) | $ 33.32 | $ 33.32 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||