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Equity Investments (Narrative) (Details) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 0 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 | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||
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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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Dec. 31, 2012
Tatex Thailand II, LLC [Member]
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Dec. 31, 2011
Tatex Thailand II, LLC [Member]
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Dec. 31, 2012
Apico 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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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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Mar. 31, 2012
Grizzly Oil Sands ULC [Member]
acre
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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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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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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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Dec. 31, 2011
Timber Wolf Terminals 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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Dec. 31, 2012
Windsor Midstream LLC [Member]
MidMar Gas 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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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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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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Jun. 30, 2012
Stingray Logistics LLC [Member]
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Dec. 31, 2011
Stingray Logistics 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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| Schedule of Equity Method Investments [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Ownership interest | 23.50% | 17.90% | 24.9999% | 15.00% | 25.00% | 40.00% | 25.00% | 50.00% | 22.50% | 28.40% | 50.00% | 50.00% | 50.00% | 50.00% | 21.40% | ||||||||||||||||||||||||||||||||||||
| 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 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Distributions received | $ 820,000 | $ 870,000 | $ 565,000 | $ 820,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) | 381,484,000 | 86,824,000 | 203,000 | 1,030,000 | 8,657,000 | 8,282,000 | 172,766,000 | 69,008,000 | 13,518,000 | 6,366,000 | 2,138,000 | 7,320,000 | 878,000 | 9,503,000 | 13,265,000 | 3,110,000 | 0 | 0 | 947,000 | 0 | 151,317,000 | 138,496,000 | 0 | ||||||||||||||||||||||||||||
| Equity method investment, percentage of remaining interest | 68.70% | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Amount of cash calls, proportionately based | 626,000 | 103,915,000 | 1,373,000 | 6,213,000 | 1,819,000 | 14,500,000 | 3,269,000 | 436,000 | 983,000 | ||||||||||||||||||||||||||||||||||||||||||
| (Income) loss from equity method investments | 8,322,000 | (1,418,000) | (977,000) | (251,000) | (172,000) | (224,000) | (1,512,000) | (1,592,000) | (740,000) | (373,000) | 357,000 | (1,031,000) | (122,000) | 663,000 | (1,235,000) | (159,000) | (436,000) | (36,000) | 12,821,000 | ||||||||||||||||||||||||||||||||
| Gas and oil areage, undeveloped, gross (acres) | 47,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Increase (decrease) due to foreign currency translation adjusment | 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 | 72,000 | 186,000 | 387,000 | 147,000 | 267,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Payments for equity method investments | 147,307,000 | 34,621,000 | 1,244,000 | 6,152,000 | 6,009,000 | 2,142,000 | 1,000,000 | 7,021,000 | |||||||||||||||||||||||||||||||||||||||||||
| 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) | $ 19.12 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Increase in equity method investment | $ 22,325,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||