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, 2013
Dec. 31, 2012
Dec. 17, 2012
Schedule of Equity Method Investments [Line Items]      
Equity investments $ 438,864 $ 381,484  
Tatex Thailand II, LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments    203  
Tatex Thailand III, LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 9,138 8,657  
Grizzly Oil Sands ULC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 176,876 172,766  
Bison Drilling And Field Services LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 13,816 13,518  
Muskie Holdings LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 8,453 7,320  
Timber Wolf Terminals LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 870 878  
Windsor Midstream LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 9,664 9,503  
Stingray Pressure Pumping LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 15,399 13,265  
Stingray Cementing LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 3,041 3,110  
Blackhawk Midstream LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 0 0  
Stingray Logistics LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 900 947  
Diamondback Energy LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments 198,662 151,317 138,500
Stingray Energy Services LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity investments $ 2,045 $ 0