Quarterly report pursuant to Section 13 or 15(d)

Equity Investments (Narrative) (Details)

v3.8.0.1
Equity Investments (Narrative) (Details)
$ / shares in Units, a in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 05, 2017
USD ($)
$ / shares
shares
Oct. 31, 2016
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2014
entity
Sep. 30, 2014
a
Sep. 30, 2017
USD ($)
a
Sep. 30, 2016
USD ($)
Dec. 31, 2014
USD ($)
Feb. 17, 2017
$ / shares
Dec. 15, 2016
$ / shares
Feb. 29, 2016
Feb. 01, 2016
USD ($)
Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]                              
Income (loss) from equity method investments and investments in subsidiaries     $ (2,737) $ 5,997       $ (20,945) $ (25,576)            
Distributions from equity method investments               4,114 14,220            
Payments for equity method investments               44,844 18,510            
Share price (in dollars per share) | $ / shares                     $ 19.48 $ 20.96      
IPO | Common Stock | Mammoth Energy Services LP                              
Schedule of Equity Method Investments [Line Items]                              
Number of shares sold by Mammoth Energy (in shares) | shares   7,750,000                          
Shares issued, price per share (in dollars per share) | $ / shares   $ 15.00                          
IPO | Common Stock | Mammoth Energy Partners LP                              
Schedule of Equity Method Investments [Line Items]                              
Equity method investment (in shares) | shares   76,250                          
Proceeds from sale of equity   $ 1,100                          
Tatex Thailand II, LLC                              
Schedule of Equity Method Investments [Line Items]                              
Income (loss) from equity method investments and investments in subsidiaries     $ 95 253       $ 549 412            
Equity method investment, ownership interest, percent     23.50%         23.50%              
Tatex Thailand III, LLC                              
Schedule of Equity Method Investments [Line Items]                              
Income (loss) from equity method investments and investments in subsidiaries     $ 0 0       $ 0 0            
Equity method investment, ownership interest, percent     17.90%         17.90%              
Grizzly Oil Sands ULC                              
Schedule of Equity Method Investments [Line Items]                              
Gas and oil area, reserve (acres) | a               830              
Income (loss) from equity method investments and investments in subsidiaries     $ (296) (363)       $ (869) (24,811)            
Other than temporary impairment loss         $ 23,100                    
Equity method investment, amount of cash calls, based on proportionate ownership interest               1,800              
Equity method investments, increase (decrease) due to foreign currency translation adjustment     $ 6,700 (1,400)       $ 12,500 8,300            
Equity method investment, ownership interest, percent     24.9999%         24.9999%              
Grizzly Oil Sands ULC | Level 3                              
Schedule of Equity Method Investments [Line Items]                              
Equity method investments, fair value of minority interest         $ 39,100                    
Windsor Midstream LLC                              
Schedule of Equity Method Investments [Line Items]                              
Income (loss) from equity method investments and investments in subsidiaries     $ 2 9,014       $ (25,232) 12,062            
Equity method investment, ownership interest, percent     22.50%         22.50%              
Loss from equity method investment, net of related out-of-pocket activity               $ 23,400              
Distributions from equity method investments               500 14,200            
Coronado Midstream LLC | Windsor Midstream LLC                              
Schedule of Equity Method Investments [Line Items]                              
Equity method investment, ownership interest, percent                             28.40%
Sturgeon Acquisitions LLC                              
Schedule of Equity Method Investments [Line Items]                              
Income (loss) from equity method investments and investments in subsidiaries     $ 0 (112)       $ 71 (623)            
Equity method investment, ownership interest, percent     0.00%     25.00%   0.00%   25.00%          
Payments for equity method investments                   $ 20,700          
Gain on sale of equity method investments $ 12,500                            
Mammoth Energy Services LP                              
Schedule of Equity Method Investments [Line Items]                              
Equity method investments, increase (decrease) due to foreign currency translation adjustment     $ 160 200       $ 200 (1,100)            
Equity method investment, ownership interest, percent     25.10%     30.50%   25.10%   30.50%          
Number of entities contributed for ownership interest | entity           4                  
Shares received from equity method investee in exchange for ownership interest (in shares) | shares 2,000,000 9,150,000                          
Share price (in dollars per share) | $ / shares $ 18.50                            
Mammoth Energy Services LP | IPO | Common Stock | Mammoth Energy Services LP                              
Schedule of Equity Method Investments [Line Items]                              
Number of shares sold by Mammoth Energy (in shares) | shares   7,500,000                          
Mammoth Energy Services LP | IPO | Common Stock | Certain selling stockholders                              
Schedule of Equity Method Investments [Line Items]                              
Number of shares sold by Mammoth Energy (in shares) | shares   250,000                          
Strike Force Midstream LLC                              
Schedule of Equity Method Investments [Line Items]                              
Income (loss) from equity method investments and investments in subsidiaries     $ (127) $ 99       $ (2,585) 40            
Equity method investment, amount of cash calls, based on proportionate ownership interest               $ 43,000              
Equity method investment, ownership interest, percent     25.00%         25.00%         25.00%    
Distributions from equity method investments               $ 3,600 $ 4,000            
Strike Force Midstream LLC | Level 3                              
Schedule of Equity Method Investments [Line Items]                              
Equity method investments, fair value of minority interest                           $ 22,500  
Phu Horm Field | Apico Llc                              
Schedule of Equity Method Investments [Line Items]                              
Gas and oil area, reserve (acres) | a               180              
Concession Acreage in Southeast Asia | Tatex Thailand III, LLC                              
Schedule of Equity Method Investments [Line Items]                              
Gas and oil area, reserve (acres) | a             245                
Apico Llc | Tatex Thailand II, LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership percentage     8.50%         8.50%              
Strike Force Midstream LLC | Rice Energy Inc                              
Schedule of Equity Method Investments [Line Items]                              
Ownership percentage by parent                         75.00%