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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Oct. 11, 2012
Schedule of Equity Method Investments [Line Items]            
Equity investments and investments in subsidiaries $ 362,391   $ 362,391   $ 369,581  
(Income) loss from equity method investments $ 15,120 $ (69,569) $ (4,855) $ (198,044)    
Tatex Thailand II, LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 23.50%   23.50%      
(Income) loss from equity method investments $ 0 0 $ 0 0    
Tatex Thailand III, LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 17.90%   17.90%      
Equity investments and investments in subsidiaries $ 0   $ 0      
(Income) loss from equity method investments $ 189 121 $ 189 170    
Grizzly Oil Sands ULC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 24.9999%   24.9999%      
Equity investments and investments in subsidiaries $ 164,113   $ 164,113   180,218  
(Income) loss from equity method investments $ 8,494 2,228 $ 12,636 4,229    
Bison Drilling And Field Services LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 0.00%   0.00%      
(Income) loss from equity method investments $ 0 (329) $ 0 1,604    
Muskie Proppant LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 0.00%   0.00%      
(Income) loss from equity method investments $ 0 (101) $ 0 433    
Timber Wolf Terminals LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 50.00%   50.00%      
Equity investments and investments in subsidiaries $ 1,000   $ 1,000   1,013  
(Income) loss from equity method investments $ 7 0 $ 13 0    
Windsor Midstream LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 22.50%   22.50%      
Equity investments and investments in subsidiaries $ 27,766   $ 27,766   13,505  
(Income) loss from equity method investments $ 881 (35) $ (17,906) (203)    
Stingray Pressure Pumping LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 0.00%   0.00%      
(Income) loss from equity method investments $ 0 1,630 $ 0 2,143    
Stingray Cementing LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 50.00%   50.00%      
Equity investments and investments in subsidiaries $ 2,002   $ 2,002   2,647  
(Income) loss from equity method investments $ 105 106 $ 172 201    
Blackhawk Midstream LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 48.50%   48.50%      
Equity investments and investments in subsidiaries $ 0   $ 0   0  
(Income) loss from equity method investments $ 0 0 $ (7,217) (84,787)    
Stingray Logistics LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 0.00%   0.00%      
Equity investments and investments in subsidiaries $ 0   $ 0   0  
(Income) loss from equity method investments $ 0 (238) $ 0 (157)    
Diamondback Energy, Inc [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 0.00%   0.00%      
Equity investments and investments in subsidiaries $ 0   $ 0   0 $ 138,500
(Income) loss from equity method investments $ 0 (72,945) $ 0 (121,712)    
Stingray Energy Services LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 50.00%   50.00%      
Equity investments and investments in subsidiaries $ 5,905   $ 5,905   $ 5,718  
(Income) loss from equity method investments $ 311 (6) $ 321 35    
Sturgeon Acquisitions LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 25.00%   25.00%   25.00%  
Equity investments and investments in subsidiaries $ 22,599   $ 22,599   $ 22,507  
(Income) loss from equity method investments $ (491) 0 $ (1,059) 0    
Mammoth Energy Partners LP [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 30.50%   30.50%   30.50%  
Equity investments and investments in subsidiaries $ 139,006   $ 139,006   $ 143,973  
(Income) loss from equity method investments $ 5,624 $ 0 $ 7,996 $ 0