Annual report pursuant to Section 13 and 15(d)

Equity Investments - Investments Accounted for by the Equity Method (Details)

v3.8.0.1
Equity Investments - Investments Accounted for by the Equity Method (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 31, 2017
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]          
Carrying value of equity investments $ 302,112 $ 243,920      
Loss (income) from equity method investments $ 5,257 33,985 $ 106,093    
Investment in Tatex Thailand II, LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 23.50%        
Carrying value of equity investments $ 0 0      
Loss (income) from equity method investments $ (549) (412) 189    
Investment in Tatex Thailand III, LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 17.90%        
Carrying value of equity investments $ 0 0      
Loss (income) from equity method investments $ (183) 0 0    
Investment in Grizzly Oil Sands ULC          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 24.9999%        
Carrying value of equity investments $ 57,641 45,213      
Loss (income) from equity method investments $ 2,189 25,150 115,544    
Investment in Timber Wolf Terminals LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 50.00%        
Carrying value of equity investments $ 983 991      
Loss (income) from equity method investments $ 8 8 14    
Investment in Windsor Midstream LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 22.50%        
Carrying value of equity investments $ 30 25,749      
Loss (income) from equity method investments $ 25,233 (13,618) (18,398)    
Investment in Stingray Cementing LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 0.00%     50.00%  
Carrying value of equity investments $ 0 1,920      
Loss (income) from equity method investments $ 205 263 147    
Investment in Blackhawk Midstream LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 48.50%        
Carrying value of equity investments $ 0 0      
Loss (income) from equity method investments $ 0 0 (7,216)    
Investment in Stingray Energy Services LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 0.00%     50.00%  
Carrying value of equity investments $ 0 4,215      
Loss (income) from equity method investments $ 282 1,044 557    
Investment in Sturgeon Acquisitions LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 0.00%       25.00%
Carrying value of equity investments $ 0 20,526      
Loss (income) from equity method investments $ (71) $ 993 (1,229)    
Investment in Mammoth Energy Services, Inc.          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 25.10% 24.20%     30.50%
Carrying value of equity investments $ 165,715 $ 111,717      
Loss (income) from equity method investments $ (23,811) 20,646 16,485    
Investment in Strike Force Midstream LLC          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership % 25.00%        
Carrying value of equity investments $ 77,743 33,589      
Loss (income) from equity method investments $ 1,954 $ (89) $ 0