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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
May 01, 2018
Dec. 31, 2017
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]              
Equity investments and investments in subsidiaries $ 218,849   $ 218,849     $ 302,112  
(Income) loss from equity method investments $ (8,888) $ 25,824 $ (22,424) $ 30,731      
Investment in Tatex Thailand II, LLC              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 23.50%   23.50%        
Equity investments and investments in subsidiaries $ 0   $ 0     0  
(Income) loss from equity method investments $ (63) (211) $ (104) (454)      
Investment in Grizzly Oil Sands ULC              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 24.9999%   24.9999%        
Equity investments and investments in subsidiaries $ 49,957   $ 49,957     57,641  
(Income) loss from equity method investments $ 228 208 $ 558 573      
Investment in Timber Wolf Terminals LLC              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 50.00%   50.00%        
Equity investments and investments in subsidiaries           983  
(Income) loss from equity method investments $ 534 0 $ 536 4      
Investment in Windsor Midstream LLC              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 22.50%   22.50%        
Equity investments and investments in subsidiaries $ 39   $ 39     30  
(Income) loss from equity method investments $ (9) 25,545 $ (9) 25,234      
Investment in Stingray Cementing LLC              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 0.00%   0.00%        
Equity investments and investments in subsidiaries $ 0   $ 0        
(Income) loss from equity method investments $ 0 77 $ 0 205      
Investment in Blackhawk Midstream LLC              
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 $ 0 0      
Investment in Stingray Energy Services LLC              
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 85 $ 0 282      
Investment in Sturgeon Acquisitions LLC              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 0.00%   0.00%       25.00%
Equity investments and investments in subsidiaries $ 0   $ 0     0  
(Income) loss from equity method investments $ 0 (139) $ 0 (71)      
Investment in Mammoth Energy Services, Inc.              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 22.20%   22.20%        
Equity investments and investments in subsidiaries $ 168,853   $ 168,853     165,715  
(Income) loss from equity method investments $ (9,242) 342 $ (22,712) 2,500      
Investment in Strike Force Midstream LLC(2)              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 0.00%   0.00%   25.00%    
Equity investments and investments in subsidiaries $ 0   $ 0     $ 77,743  
(Income) loss from equity method investments $ (336) $ (83) $ (693) $ 2,458