Quarterly report pursuant to Section 13 or 15(d)

Equity Investments (Narrative) (Details)

v3.5.0.2
Equity Investments (Narrative) (Details)
a in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 28, 2014
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
a
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2012
Oct. 05, 2012
USD ($)
Schedule of Equity Method Investments [Line Items]                      
Impairment of oil and gas properties     $ 170,621,000 $ 0   $ 389,612,000 $ 0        
Income (loss) from equity method investments     (836,000) (15,120,000)   (31,573,000) 4,855,000        
Distributions from equity method investments           4,658,000 4,612,000        
Payments for equity method investments           $ 16,690,000 8,267,000        
Investment in Tatex Thailand II, LLC                      
Schedule of Equity Method Investments [Line Items]                      
Equity shares owned by affiliate (shares) | shares           85,122          
Total shares owned of subaffiliate (shares) | shares           1,000,000          
Gas and oil area, reserve (acres) | a           243          
Income (loss) from equity method investments     $ 0 0   $ 159,000 0        
Ownership interest, percent     23.50%     23.50%          
Investment in Tatex Thailand III, LLC                      
Schedule of Equity Method Investments [Line Items]                      
Gas and oil area, reserve (acres) | a           245          
Income (loss) from equity method investments     $ 0 (189,000)   $ 0 (189,000)        
Ownership interest, percent     17.90%     17.90%          
Investment in Grizzly Oil Sands ULC                      
Schedule of Equity Method Investments [Line Items]                      
Gas and oil area, reserve (acres) | a           830          
Impairment of oil and gas properties           $ 23,100,000          
Income (loss) from equity method investments     $ (763,000) (8,494,000)   (24,448,000) (12,636,000)        
Equity method investment, amount of cash calls, based on proportionate ownership interest           13,700,000          
Equity Method Investments, Increase (Decrease) Due To Foreign Currency Translation Adjustment     $ (600,000) 3,200,000   $ 9,700,000 11,700,000        
Ownership interest, percent     24.9999%     24.9999%          
Investment in Windsor Midstream LLC                      
Schedule of Equity Method Investments [Line Items]                      
Income (loss) from equity method investments     $ 2,881,000 (881,000)   $ 3,048,000 17,906,000        
Distributions from equity method investments           $ 4,900,000          
Ownership interest, percent     22.50%     22.50%          
Investment in Windsor Midstream LLC | MidMar Gas LLC                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest, percent                   28.40%  
Coronado Midstream | Investment in Windsor Midstream LLC                      
Schedule of Equity Method Investments [Line Items]                      
Proceeds from sale of interest in partnership unit   $ 600,000,000                  
Gain on sale on investment   $ 81,600,000                  
Investment in Blackhawk Midstream LLC                      
Schedule of Equity Method Investments [Line Items]                      
Income (loss) from equity method investments     $ 0 0   $ 0 7,217,000        
Ownership interest, percent     48.50%     48.50%          
Investment in Blackhawk Midstream LLC | Ohio Gathering Company, LLC and Ohio Condensate Company, LLC                      
Schedule of Equity Method Investments [Line Items]                      
Purchase price of sold equity interests $ 190,000,000                    
Amount put in escrow $ 14,300,000                    
Proceeds from release of escrow deposits         $ 7,200,000            
Investment in Sturgeon Acquisitions LLC                      
Schedule of Equity Method Investments [Line Items]                      
Income (loss) from equity method investments     $ (134,000) 491,000   $ (511,000) 1,059,000        
Ownership interest, percent     25.00%     25.00%          
Payments for equity method investments               $ 20,700,000      
Investment in Mammoth Energy Partners LP                      
Schedule of Equity Method Investments [Line Items]                      
Income (loss) from equity method investments     $ (2,543,000) (5,624,000)   $ (9,009,000) (7,996,000)        
Equity Method Investments, Increase (Decrease) Due To Foreign Currency Translation Adjustment           $ (1,300,000)          
Ownership interest, percent     30.50%     30.50%          
Investment in Strike Force Midstream LLC                      
Schedule of Equity Method Investments [Line Items]                      
Income (loss) from equity method investments     $ (59,000) $ 0   $ (59,000) $ 0        
Equity method investment, amount of cash calls, based on proportionate ownership interest           $ 3,000,000          
Ownership interest, percent     25.00%     25.00%          
Investment in Strike Force Midstream LLC | Rice Energy Inc                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest, percent     75.00%     75.00%          
Revolving Credit Facility | Subsidiaries                      
Schedule of Equity Method Investments [Line Items]                      
Revolving credit facility                     $ 125,000,000.0
Credit facility outstanding     $ 57,200,000     $ 57,200,000          
Level 3 | Investment in Grizzly Oil Sands ULC                      
Schedule of Equity Method Investments [Line Items]                      
Equity investment at fair value                 $ 39,100,000