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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]            
Equity investments $ 251,309   $ 251,309   $ 242,393  
(Income) loss from equity method investments $ (5,997) $ 61,891 $ 25,576 $ 57,036    
Investment in Tatex Thailand II, LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 23.50%   23.50%      
(Income) loss from equity method investments $ (253) 0 $ (412) 189    
Investment in Tatex Thailand III, LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 17.90%   17.90%      
Equity investments $ 0   $ 0      
(Income) loss from equity method investments $ 0 0 $ 0 0    
Investment in Grizzly Oil Sands ULC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 24.9999%   24.9999%      
Equity investments $ 48,595   $ 48,595   50,645  
(Income) loss from equity method investments $ 363 58,653 $ 24,811 71,289    
Investment in Timber Wolf Terminals LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 50.00%   50.00%      
Equity investments $ 993   $ 993   999  
(Income) loss from equity method investments $ 3 0 $ 7 13    
Investment in Windsor Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 22.50%   22.50%      
Equity investments $ 25,797   $ 25,797   27,955  
(Income) loss from equity method investments $ (9,014) (323) $ (12,062) (18,229)    
Investment in Stingray Cementing LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 50.00%   50.00%      
Equity investments $ 2,084   $ 2,084   2,487  
(Income) loss from equity method investments $ 79 (12) $ 187 160    
Investment in Blackhawk Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 48.50%   48.50%      
Equity investments $ 0   $ 0   0  
(Income) loss 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 $ 4,382   $ 4,382   5,908  
(Income) loss from equity method investments $ 294 218 $ 935 539    
Investment in Sturgeon Acquisitions LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 25.00%   25.00%      
Equity investments $ 22,146   $ 22,146   22,769  
(Income) loss from equity method investments $ 112 (257) $ 623 (1,316)    
Investment in Mammoth Energy Partners LP            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 30.50%   30.50%     30.50%
Equity investments $ 120,773   $ 120,773   131,630  
(Income) loss from equity method investments $ 2,518 3,612 $ 11,527 11,608    
Investment in Strike Force Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 25.00%   25.00%      
Equity investments $ 26,539   $ 26,539   $ 0  
(Income) loss from equity method investments $ (99) $ 0 $ (40) $ 0