Quarterly report pursuant to Section 13 or 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 $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]    
Equity investments $ 185,934 $ 86,824
Tatex Thailand II, LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity investments 829 1,030
Tatex Thailand III, LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity investments 8,840 8,282
Grizzly Oil Sands ULC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity investments 144,810 69,008
Bison Drilling And Field Services LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity investments 14,228 6,366
Muskie Holdings LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity investments 4,310 2,138
Timber Wolf Terminals LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity investments 977   
Windsor Midstream LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity investments 7,710   
Stingray Pressure Pumping LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity investments 3,940   
Stingray Cementing LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity investments 290   
Blackhawk Midstream LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity investments