Annual report pursuant to Section 13 and 15(d)

Equity Investments (Investments Accounted For By The Equity Method) (Details)

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Equity Investments (Investments Accounted For By The Equity Method) (Details) (USD $)
Dec. 31, 2012
Dec. 17, 2012
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) $ 381,484,000   $ 86,824,000
Tatex Thailand II, LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 203,000   1,030,000
Tatex Thailand III, LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 8,657,000   8,282,000
Grizzly Oil Sands ULC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 172,766,000   69,008,000
Bison Drilling And Field Services LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 13,518,000   6,366,000
Muskie Holdings LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 7,320,000   2,138,000
Timber Wolf Terminals LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 878,000     
Windsor Midstream LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 9,503,000     
Stingray Pressure Pumping LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 13,265,000     
Stingray Cementing LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 3,110,000     
Blackhawk Midstream LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 0   0
Stingray Logistics LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) 947,000   0
Diamondback Energy LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Equity investments ($151,317,000 and $0 attributable to fair value option in 2012 and 2011, respectively) $ 151,317,000 $ 138,496,000 $ 0