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Fresh-Start Accounting - Increase in Capital Accounts (Details) - USD ($)
$ in Thousands
2 Months Ended 10 Months Ended 12 Months Ended
Feb. 28, 2017
Feb. 28, 2017
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Net Increase in Capital Accounts          
Common stock to holders of Unsecured Notes and general unsecured creditors         $ 133,805
Payment of issuance costs   $ 0 $ (22,170) $ 0 (9,193)
Dividend related to beneficial conversion feature of preferred stock         11,301
Additional paid-in capital       901,830 914,540
Successor common stock $ 33 33   $ 85 $ 82
Successor preferred stock 335,000 335,000      
Reorganization Adjustments          
Net Increase in Capital Accounts          
Common stock to holders of Unsecured Notes and general unsecured creditors 543,562        
Payment of issuance costs (35)        
Dividend related to beneficial conversion feature of preferred stock 27,751        
Successor common stock 33 33      
Change in additional paid-in capital 3,369,959 3,369,959      
Successor preferred stock 335,000 335,000      
Net increase in capital accounts 906,278        
Predecessor additional paid-in capital | Reorganization Adjustments          
Net Increase in Capital Accounts          
Additional paid-in capital $ (2,798,714) $ (2,798,714)