Quarterly report pursuant to Section 13 or 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 6 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jan. 22, 2014
Jul. 30, 2013
Restructuring Cost and Reserve [Line Items]                
Gain on settlement of liabilities subject to compromise $ 0 $ (191,129) $ 0 $ 0 $ 0      
Fresh start valuation adjustments 0 242,567 0 0 0      
Professional fees 0 30,107 0 1,173 0      
Backstop premium on the rights offering paid in stock 211 11,033 0 0 0      
Other 0 399 0 0 0      
Reorganization items 211 92,977 $ 0 1,173 0      
Reorganization items paid   $ 8,617   22,081 $ 0      
Liabilities subject to compromise $ 0     $ 0   $ 600,996    
Predecessor 6.75% senior notes, due July 2022                
Restructuring Cost and Reserve [Line Items]                
Debt instrument fixed interest rate 6.75%     6.75%     6.75%  
Liabilities subject to compromise, long-term debt $ 0     $ 0   360,000    
Predecessor 7.50% senior notes, due August 2020                
Restructuring Cost and Reserve [Line Items]                
Debt instrument fixed interest rate 7.50%     7.50%       7.50%
Liabilities subject to compromise, long-term debt $ 0     $ 0   225,000    
Senior Notes                
Restructuring Cost and Reserve [Line Items]                
Liabilities subject to compromise, long-term debt $ 0     $ 0   $ 15,996