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
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Feb. 01, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]          
Equity investments $ 244,601     $ 242,393  
Loss (income) from equity method investments $ 30,737 $ (19,975)      
Investment in Tatex Thailand II, LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 23.50%        
Loss (income) from equity method investments $ (159) 0      
Investment in Tatex Thailand III, LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 17.90%        
Equity investments $ 0        
Loss (income) from equity method investments $ 0 0      
Investment in Grizzly Oil Sands ULC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 24.9999%        
Equity investment $ 39,054        
Equity investments       50,645  
Loss (income) from equity method investments $ 23,685 4,142      
Investment in Timber Wolf Terminals LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 50.00%        
Equity investments $ 996     999  
Loss (income) from equity method investments $ 3 6      
Investment in Windsor Midstream LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 22.50%        
Equity investments $ 27,985     27,955  
Loss (income) from equity method investments $ (167) (18,787)      
Investment in Stingray Cementing LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 50.00%        
Equity investments $ 2,461     2,487  
Loss (income) from equity method investments $ 30 67      
Investment in Blackhawk Midstream LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 48.50%        
Equity investments $ 0     0  
Loss (income) from equity method investments $ 0 (7,217)      
Investment in Stingray Energy Services LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 50.00%        
Equity investments $ 5,254     5,908  
Loss (income) from equity method investments $ 502 10      
Investment in Sturgeon Acquisitions LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 25.00%        
Equity investments $ 22,393     22,769  
Loss (income) from equity method investments $ 377 (568)      
Investment in Mammoth Energy Partners LP          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 30.50%       30.50%
Equity investments $ 123,958     131,630  
Loss (income) from equity method investments $ 6,466 2,372      
Investment in Strike Force Midstream LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 25.00%        
Equity investment $ 22,500        
Equity investments     $ 22,500 $ 0  
Loss (income) from equity method investments 0 $ 0      
Level 3 | Investment in Grizzly Oil Sands ULC          
Schedule of Equity Method Investments [Line Items]          
Equity investment $ 39,054