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Equity Investments (Narrative) (Details) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 27 Months Ended | 12 Months Ended | |||||||||||||||
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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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Dec. 31, 2011
Tatex Thailand II, LLC [Member]
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Dec. 31, 2010
Tatex Thailand II, LLC [Member]
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Dec. 31, 2005
Tatex Thailand II, 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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Dec. 31, 2009
Tatex Thailand III, LLC [Member]
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Mar. 31, 2008
Tatex Thailand III, LLC [Member]
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Dec. 31, 2005
APICO, LLC [Member]
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Apr. 30, 2010
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. 31, 2009
Grizzly Oil Sands ULC [Member]
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Mar. 31, 2010
Grizzly Oil Sands ULC [Member]
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Dec. 07, 2011
Grizzly Oil Sands ULC [Member]
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Oct. 15, 2010
Grizzly Oil Sands ULC [Member]
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Sep. 30, 2006
Grizzly Oil Sands ULC [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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Dec. 31, 2011
Muskie Holdings LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||||||||||||||||||||
| Ownership interest | 23.50% | 17.90% | 5.00% | 24.9999% | 25.00% | 25.00% | ||||||||||||||||
| Equity method investment additional ownership percentage | 12.90% | |||||||||||||||||||||
| Ownership interest cost | $ 2,400,000 | $ 3,385,000 | $ 850,000 | $ 8,199,000 | $ 6,009,000 | $ 2,142,000 | ||||||||||||||||
| Equity shares owned by affiliate | 85,122 | |||||||||||||||||||||
| Common stock, shares outstanding | 55,621,371 | 44,645,435 | 1,000,000 | |||||||||||||||||||
| Distributions received | 870,000 | |||||||||||||||||||||
| Cash calls paid | 3,794,000 | |||||||||||||||||||||
| Equity investments | 86,824,000 | 33,021,000 | 1,030,000 | 1,907,000 | 8,282,000 | 4,660,000 | 69,008,000 | 26,454,000 | 6,366,000 | 2,138,000 | ||||||||||||
| Loss from equity investments | (1,418,000) | (977,000) | (706,000) | (172,000) | (224,000) | (207,000) | (1,592,000) | (740,000) | (498,000) | 357,000 | ||||||||||||
| Increase decrease in equity method investment due to foreign currency translation adjustment | (855,000) | 1,313,000 | ||||||||||||||||||||
| Borrowed funds interest rate | LIBOR plus 400 basis points | |||||||||||||||||||||
| Debt instrument, adjusted maturity date | December 31, 2011 | December 31, 2012 | ||||||||||||||||||||
| Debt instrument, maturity date | Dec. 31, 2012 | |||||||||||||||||||||
| Interest rate | 0.69% | |||||||||||||||||||||
| Loan to Grizzly | 3,182,000 | |||||||||||||||||||||
| Interest income | 186,000 | 387,000 | 564,000 | 147,000 | 267,000 | 547,000 | ||||||||||||||||
| Foreign currency translation adjustment | (1,085,000) | 942,000 | ||||||||||||||||||||
| Total due from Grizzly | 22,325,000 | |||||||||||||||||||||
| Currency transaction loss in note receivable | $ 75,000 | |||||||||||||||||||||