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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Oct. 11, 2012
Schedule of Equity Method Investments [Line Items]            
Equity investments and investments in subsidiaries $ 295,103   $ 295,103   $ 369,581  
(Income) loss from equity method investments $ 61,891 $ 34,477 $ 57,036 $ (163,567)    
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 (475) $ 189 (475)    
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 $ 0 47 $ 0 217    
Grizzly Oil Sands ULC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 24.9999%   24.9999%      
Equity investments and investments in subsidiaries         180,218  
(Income) loss from equity method investments $ 58,653 4,633 $ 71,289 8,862    
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 (1,273) $ 0 331    
Muskie Proppant LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 0.00%   0.00%      
(Income) loss from equity method investments $ 0 55 $ 0 488    
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 $ 0 7 $ 13 7    
Windsor Midstream LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 22.50%   22.50%      
Equity investments and investments in subsidiaries $ 27,940   $ 27,940   13,505  
(Income) loss from equity method investments $ (323) (301) $ (18,229) (504)    
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 (351) $ 0 1,792    
Stingray Cementing LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 50.00%   50.00%      
Equity investments and investments in subsidiaries $ 2,127   $ 2,127   2,647  
(Income) loss from equity method investments $ (12) (12) $ 160 189    
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 (256) $ 0 (413)    
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 32,412 $ 0 (89,300)    
Stingray Energy Services LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Approximate Ownership % 50.00%   50.00%      
Equity investments and investments in subsidiaries $ 5,718   $ 5,718   $ 5,718  
(Income) loss from equity method investments $ 218 (9) $ 539 26    
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 $ 22,857   $ 22,857   $ 22,507  
(Income) loss from equity method investments $ (257) 0 $ (1,316) 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 $ 135,971   $ 135,971   $ 143,973  
(Income) loss from equity method investments $ 3,612 $ 0 $ 11,608 $ 0