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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 01, 2016
Dec. 31, 2018
Dec. 31, 2017
Successor        
Supplemental Disclosure of Cash Flow Information        
Cash paid for reorganization items $ 0   $ 0 $ 0
Cash paid for interest, net of amounts capitalized (1,183)   (4,045) (2,438)
Cash received (paid) for income taxes 0   4,381 4,348
Supplemental Disclosure of Noncash Investing and Financing Activities        
Cumulative effect of adoption of ASU 2015-02 0   0 0
Property, plant and equipment transferred in contract settlement 0   0 0
Change in accrued capital expenditures 10,630   (15,861) (28,999)
Equity issued for debt $ (13,001)   $ 0 $ (268,779)
Predecessor        
Supplemental Disclosure of Cash Flow Information        
Cash paid for reorganization items   $ (55,606)    
Cash paid for interest, net of amounts capitalized   (104,609)    
Cash received (paid) for income taxes   (28)    
Supplemental Disclosure of Noncash Investing and Financing Activities        
Cumulative effect of adoption of ASU 2015-02   (247,566)    
Property, plant and equipment transferred in contract settlement   215,635    
Change in accrued capital expenditures   25,045    
Equity issued for debt   $ (4,409)