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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]          
Equity investments $ 253,047   $ 253,047   $ 242,393
Loss (income) from equity method investments $ 836 $ 15,120 $ 31,573 $ (4,855)  
Investment in Tatex Thailand II, LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 23.50%   23.50%    
Loss (income) from equity method investments $ 0 0 $ (159) 0  
Investment in Tatex Thailand III, LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 17.90%   17.90%    
Equity investments $ 0   $ 0    
Loss (income) from equity method investments $ 0 189 $ 0 189  
Investment in Grizzly Oil Sands ULC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 24.9999%   24.9999%    
Equity investments $ 49,556   $ 49,556   50,645
Loss (income) from equity method investments $ 763 8,494 $ 24,448 12,636  
Investment in Timber Wolf Terminals LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 50.00%   50.00%    
Equity investments $ 996   $ 996   999
Loss (income) from equity method investments $ 1 7 $ 4 13  
Investment in Windsor Midstream LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 22.50%   22.50%    
Equity investments $ 26,147   $ 26,147   27,955
Loss (income) from equity method investments $ (2,881) 881 $ (3,048) (17,906)  
Investment in Stingray Cementing LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 50.00%   50.00%    
Equity investments $ 2,359   $ 2,359   2,487
Loss (income) from equity method investments $ 78 105 $ 108 172  
Investment in Blackhawk Midstream LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 48.50%   48.50%    
Equity investments $ 0   $ 0   0
Loss (income) from equity method investments $ 0 0 $ 0 (7,217)  
Investment in Stingray Energy Services LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 50.00%   50.00%    
Equity investments $ 4,981   $ 4,981   5,908
Loss (income) from equity method investments $ 139 311 $ 641 321  
Investment in Sturgeon Acquisitions LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 25.00%   25.00%    
Equity investments $ 22,258   $ 22,258   22,769
Loss (income) from equity method investments $ 134 (491) $ 511 (1,059)  
Investment in Mammoth Energy Partners LP          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 30.50%   30.50%    
Equity investments $ 121,309   $ 121,309   131,630
Loss (income) from equity method investments $ 2,543 5,624 $ 9,009 7,996  
Investment in Strike Force Midstream LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 25.00%   25.00%    
Equity investments $ 25,441   $ 25,441   $ 0
Loss (income) from equity method investments $ 59 $ 0 $ 59 $ 0