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Equity Investments (Narrative) (Details) (USD $)
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3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | ||||||||||||||||
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Mar. 31, 2012
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Mar. 31, 2011
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Dec. 31, 2011
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Mar. 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, 2012
Tatex Thailand III, LLC [Member]
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Mar. 31, 2011
Tatex Thailand III, LLC [Member]
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Dec. 31, 2011
Tatex Thailand III, LLC [Member]
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Mar. 31, 2012
APICO, LLC [Member]
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Mar. 31, 2012
Grizzly Oil Sands ULC [Member]
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Mar. 31, 2011
Grizzly Oil Sands ULC [Member]
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Dec. 31, 2011
Grizzly Oil Sands ULC [Member]
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Dec. 07, 2011
Grizzly Oil Sands ULC [Member]
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Mar. 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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Sep. 30, 2011
Bison Drilling And Field Services LLC [Member]
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Mar. 31, 2012
Muskie Holdings LLC [Member]
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Dec. 31, 2011
Muskie Holdings LLC [Member]
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Mar. 31, 2012
Timber Wolf Terminals LLC [Member]
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Mar. 31, 2012
Windsor Midstream LLC [Member]
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Mar. 31, 2012
MidMar [Member]
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Mar. 31, 2012
Wexford Capital LP [Member]
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Jun. 30, 2012
Scenario, Forecast [Member]
Bison Drilling And Field Services LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | |||||||||||||||||||||||
| Ownership interest | 23.50% | 17.90% | 24.9999% | 25.00% | 25.00% | 50.00% | 22.50% | 28.40% | 40.00% | ||||||||||||||
| Remaining interests in investee, percent | 68.70% | ||||||||||||||||||||||
| Increase in investment of affiliate due to conversion of debt to equity | $ 22,325,000 | ||||||||||||||||||||||
| Equity method investment additional ownership percentage | 15.00% | ||||||||||||||||||||||
| Ownership interest cost | 6,009,000 | 2,142,000 | 1,000,000 | 7,021,000 | 6,152,000 | ||||||||||||||||||
| Equity shares owned by affiliate | 85,122 | ||||||||||||||||||||||
| Common stock, shares outstanding | 55,649,717 | 55,621,371 | 1,000,000 | ||||||||||||||||||||
| Distributions received | 200,000 | ||||||||||||||||||||||
| Cash calls paid | 483,000 | 67,063,000 | 312,000 | ||||||||||||||||||||
| Equity investments | 163,174,000 | 86,824,000 | 829,000 | 1,030,000 | 8,731,000 | 8,282,000 | 136,732,000 | 69,008,000 | 6,361,000 | 6,366,000 | 2,441,000 | 2,138,000 | 1,000,000 | 7,080,000 | |||||||||
| Loss from equity investments | (268,000) | (316,000) | (34,000) | (56,000) | (278,000) | (255,000) | 59,000 | ||||||||||||||||
| Increase decrease in equity method investment due to foreign currency translation adjustment | 939,000 | 706,000 | |||||||||||||||||||||
| Interest income | 27,000 | 38,000 | 36,000 | ||||||||||||||||||||
| Currency transaction loss in note receivable | $ 75,000 | ||||||||||||||||||||||