Quarterly report pursuant to Section 13 or 15(d)

Chapter 11 Emergence - Narrative (Details)

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Chapter 11 Emergence - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 26, 2019
Dec. 12, 2018
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Dec. 31, 2018
Jan. 22, 2014
Jul. 30, 2013
Restructuring Cost and Reserve [Line Items]                  
Shares called by warrants (in shares)       1          
Reorganization items       $ 962 $ 92,977 $ 0      
Debtor in possession financing       $ 0     $ 10,000    
Contractual interest expense         $ 10,300        
Series A Preferred Stock                  
Restructuring Cost and Reserve [Line Items]                  
Preferred dividend percentage     7.25%            
Common Stock                  
Restructuring Cost and Reserve [Line Items]                  
Issuances of common stock (in shares) 15,044,000                
Common Stock | Backstop Commitment Agreement, Commitment Premium                  
Restructuring Cost and Reserve [Line Items]                  
Issuances of common stock (in shares)   504,577              
Common Stock | Backstop Commitment Agreement, Unsubscribed Shares                  
Restructuring Cost and Reserve [Line Items]                  
Issuances of common stock (in shares)   1,403,910              
Common Stock | Backstop Commitment Agreement, Rights Offering                  
Restructuring Cost and Reserve [Line Items]                  
Issuances of common stock (in shares)   4,903,308              
Common Stock | 7.50% Note Holders                  
Restructuring Cost and Reserve [Line Items]                  
Issuances of common stock (in shares)   2,827,323              
Common Stock | 6.75% Note Holders                  
Restructuring Cost and Reserve [Line Items]                  
Issuances of common stock (in shares)   5,178,860              
Common Stock | Predecessor Preferred Stock Holders                  
Restructuring Cost and Reserve [Line Items]                  
Issuances of common stock (in shares)   90,558              
Warrants to purchase common stock (in shares)   1,032,073              
Shares called by warrants (in shares)   1,032,073              
Common Stock | Predecessor Common Stock Holders                  
Restructuring Cost and Reserve [Line Items]                  
Issuances of common stock (in shares)   135,838              
Warrants to purchase common stock (in shares)   1,548,109              
Shares called by warrants (in shares)   1,548,109              
Predecessor 7.50% senior notes, due August 2020                  
Restructuring Cost and Reserve [Line Items]                  
Debt instrument fixed interest rate       7.50%         7.50%
Predecessor 6.75% senior notes, due July 2022                  
Restructuring Cost and Reserve [Line Items]                  
Debt instrument fixed interest rate       6.75%       6.75%