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
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 17, 2012
Schedule of Equity Method Investments [Line Items]        
Equity investments $ 499,419   $ 440,068  
(Income) loss from equity method investments (128,475) (61,210)    
Tatex Thailand II, LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 23.50%      
Equity investments          
(Income) loss from equity method investments 0 0    
Tatex Thailand III, LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 17.90%      
Equity investments 10,725   10,774  
(Income) loss from equity method investments 49 18    
Grizzly Oil Sands ULC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 25.00%      
Equity investments 190,263   191,473  
(Income) loss from equity method investments 2,001 532    
Bison Drilling And Field Services LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 40.00%      
Equity investments 22,608   12,318  
(Income) loss from equity method investments 1,933 (148)    
Muskie Holdings LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 25.00%      
Equity investments 8,011   7,544  
(Income) loss from equity method investments 534 441    
Timber Wolf Terminals LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 50.00%      
Equity investments 1,001   1,001  
(Income) loss from equity method investments 0 8    
Windsor Midstream LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 22.50%      
Equity investments 13,195   10,632  
(Income) loss from equity method investments (168) (384)    
Stingray Pressure Pumping LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 50.00%      
Equity investments 18,872   19,624  
(Income) loss from equity method investments 513 (703)    
Stingray Cementing LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 50.00%      
Equity investments 3,067   3,291  
(Income) loss from equity method investments 95 22    
Blackhawk Midstream LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 50.00%      
Equity investments 0   0  
(Income) loss from equity method investments (84,787) 39    
Stingray Logistics LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 50.00%      
Equity investments 821   903  
(Income) loss from equity method investments 81 26    
Diamondback Energy, Inc [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 6.70%      
Equity investments 227,474   178,708 138,500
(Income) loss from equity method investments (48,767) (61,096)    
Stingray Energy Services LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership percentage 50.00%      
Equity investments 3,382   3,800  
(Income) loss from equity method investments $ 41 $ 35