Annual report pursuant to Section 13 and 15(d)

Chapter 11 Emergence - Reorganization Items and Liabilities Subject to Compromise (Details)

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Chapter 11 Emergence - Reorganization Items and Liabilities Subject to Compromise (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Jan. 22, 2014
Jul. 30, 2013
Restructuring Cost and Reserve [Line Items]            
Gain on settlement of liabilities subject to compromise $ (191,129) $ 0 $ 0      
Fresh start valuation adjustments 242,567 0 0      
Professional fees 30,107 1,173 2,251      
Backstop premium on the rights offering paid in stock 11,033 0 0      
Unamortized Debt Issuance Expense     975      
Other 399 0 0      
Reorganization items 92,977 1,173 9,789      
Reorganization items paid $ 8,617 22,168 0      
Liabilities subject to compromise   0 600,996      
Predecessor senior notes            
Restructuring Cost and Reserve [Line Items]            
Liabilities subject to compromise, long-term debt   $ 0 15,996      
Predecessor 6.75% senior notes, due July 2022            
Restructuring Cost and Reserve [Line Items]            
Unamortized Debt Issuance Expense     3,775      
Fixed interest rate   6.75%   6.75% 6.75%  
Liabilities subject to compromise, long-term debt   $ 0 360,000      
Predecessor 7.50% senior notes, due August 2020            
Restructuring Cost and Reserve [Line Items]            
Unamortized Debt Issuance Expense     1,580      
Fixed interest rate   7.50%   7.50%   7.50%
Liabilities subject to compromise, long-term debt   $ 0 225,000      
Revolving Credit Facility            
Restructuring Cost and Reserve [Line Items]            
Unamortized Debt Issuance Expense     $ 1,208