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
Mar. 31, 2019
Mar. 26, 2019
Dec. 12, 2018
Mar. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Jan. 22, 2014
Jul. 30, 2013
Restructuring Cost and Reserve [Line Items]                
Issuances of common stock (in shares) 15,044,000              
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 | 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%