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Equity Method Investments and Membership Interests in Joint Ventures (Schedule of Equity Method Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2016
Sep. 30, 2015
Oct. 01, 2016
Dec. 31, 2015
Dec. 31, 2014
Millennium [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Impairment of equity investment   $ (38,000)        
Tongue River [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Impairment of equity investment     $ (21,300)      
Predecessor [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Beginning Balance $ 102,625     $ 201,877 $ 235,842 $ 221,456
Advances to (distributions from) affiliates, net       (4,934) (18,360) 4,054
Equity in comprehensive income (loss)       5,314 7,979 10,332
Impairment of equity investment       (38,025) (21,325)  
Sale of equity investment         (2,259)  
Fresh start accounting adjustment       (61,607)    
Ending Balance       102,625 201,877 235,842
Predecessor [Member] | Knight Hawk [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Beginning Balance 94,000     151,592 158,477 152,806
Advances to (distributions from) affiliates, net       (8,374) (29,862) (12,603)
Equity in comprehensive income (loss)       9,033 22,977 18,274
Impairment of equity investment       0    
Fresh start accounting adjustment       (58,251)    
Ending Balance       94,000 151,592 158,477
Predecessor [Member] | DTA [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Beginning Balance 8,600     13,239 13,738 14,137
Advances to (distributions from) affiliates, net       1,474 3,207 3,774
Equity in comprehensive income (loss)       (2,095) (3,706) (4,173)
Fresh start accounting adjustment       (4,018)    
Ending Balance       8,600 13,239 13,738
Predecessor [Member] | Millennium [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Beginning Balance 0     37,589 40,223 35,894
Advances to (distributions from) affiliates, net       1,966 7,052 6,742
Equity in comprehensive income (loss)       (1,530) (9,686) (2,413)
Impairment of equity investment       (38,025)    
Fresh start accounting adjustment       0    
Ending Balance       0 37,589 40,223
Predecessor [Member] | Tongue River [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Beginning Balance 0       20,740 18,419
Advances to (distributions from) affiliates, net       0 913 2,541
Equity in comprehensive income (loss)       0 (328) (220)
Impairment of equity investment       0 (21,325)  
Fresh start accounting adjustment       0    
Ending Balance       0   20,740
Predecessor [Member] | Other [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Beginning Balance 25     (543) 2,664 200
Advances to (distributions from) affiliates, net       0 330 3,600
Equity in comprehensive income (loss)       (94) (1,278) (1,136)
Impairment of equity investment       0    
Sale of equity investment         (2,259)  
Fresh start accounting adjustment       662    
Ending Balance       $ 25 $ (543) $ 2,664
Successor [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Advances to (distributions from) affiliates, net (8,254)          
Equity in comprehensive income (loss) 1,703          
Ending Balance 96,074          
Successor [Member] | Knight Hawk [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Advances to (distributions from) affiliates, net (9,076)          
Equity in comprehensive income (loss) 2,569          
Ending Balance 87,493          
Successor [Member] | DTA [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Advances to (distributions from) affiliates, net 822          
Equity in comprehensive income (loss) (841)          
Ending Balance 8,581          
Successor [Member] | Millennium [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Ending Balance 0          
Successor [Member] | Tongue River [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Ending Balance 0          
Successor [Member] | Other [Member]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]            
Equity in comprehensive income (loss) (25)          
Ending Balance $ 0