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Long-Term Debt - Narrative (Details)
shares in Millions
1 Months Ended 2 Months Ended
Feb. 08, 2019
USD ($)
Sep. 14, 2018
Aug. 31, 2018
USD ($)
Dec. 28, 2017
USD ($)
shares
Mar. 31, 2017
USD ($)
Sep. 27, 2016
USD ($)
payment
shares
Feb. 17, 2016
USD ($)
shares
Feb. 08, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jul. 03, 2013
USD ($)
Aug. 19, 2010
USD ($)
Debt Instrument [Line Items]                        
Principal amount                 $ 334,473,000 $ 130,000,000    
10% Senior Secured Notes due 2021                        
Debt Instrument [Line Items]                        
Shares issued (in shares) | shares       2.2                
Extinguishment of debt, amount       $ 4,800,000                
2021 Notes And 2021 PIK Notes                        
Debt Instrument [Line Items]                        
Liabilities subject to compromise, debt and accrued interest                 20,600,000      
Senior Notes | 10% Senior Unsecured Notes due 2017                        
Debt Instrument [Line Items]                        
Principal amount                     $ 200,000,000 $ 150,000,000
Stated interest rate                     10.00% 10.00%
Long-term debt             $ 135,600,000          
Senior Notes | 10% Senior Secured Notes due 2021                        
Debt Instrument [Line Items]                        
Principal amount                 9,427,000 0    
Senior Notes | 2021 Notes And 2021 PIK Notes                        
Debt Instrument [Line Items]                        
Loan forbearance, non payment of interest, period   30 days                    
Payment in Kind (PIK) Note | 10% Senior Secured Notes due 2021                        
Debt Instrument [Line Items]                        
Stated interest rate 10.00%             10.00%        
Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021                        
Debt Instrument [Line Items]                        
Principal amount                 275,046,000 $ 0    
Stated interest rate 10.00%             10.00%        
Private Exchange Offer and Consent Solicitation                        
Debt Instrument [Line Items]                        
Repayments of debt             53,600,000          
Private Exchange Offer and Consent Solicitation | Senior Notes | 10% Senior Unsecured Notes due 2017                        
Debt Instrument [Line Items]                        
Debt conversion, original debt, amount             $ 214,400,000          
Debt conversion, original debt, percent of total             61.00%          
Gain on extinguishment of debt             $ 0          
Private Exchange Offer and Consent Solicitation | Senior Notes | 10% Senior Secured Notes due 2021                        
Debt Instrument [Line Items]                        
Stated interest rate             10.00%     10.00%    
Debt conversion, amount             $ 144,700,000          
Interest expense, debt               $ 100,000 100,000      
Excess (shortfall) carrying value             $ 13,900,000          
Private Exchange Offer and Consent Solicitation | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021                        
Debt Instrument [Line Items]                        
Stated interest rate                   10.00%    
Interest expense, debt               $ 2,900,000 4,100,000      
Excess (shortfall) carrying value           $ (600,000)            
September Exchange and Consent Solicitation | Senior Notes | 10% Senior Unsecured Notes due 2017                        
Debt Instrument [Line Items]                        
Debt conversion, original debt, amount           $ 113,000,000            
Debt conversion, original debt, percent of total           83.00%            
Repayments of debt         $ 22,800,000              
Long-term debt           $ 22,700,000            
Gain on extinguishment of debt           0            
September Exchange and Consent Solicitation | Senior Notes | 10% Senior Secured Notes due 2021                        
Debt Instrument [Line Items]                        
Debt conversion, original debt, amount           $ 130,500,000            
Debt conversion, original debt, percent of total           90.00%            
Long-term debt           $ 14,200,000            
September Exchange and Consent Solicitation | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021                        
Debt Instrument [Line Items]                        
Debt conversion, amount           $ 243,500,000            
Number of interest payments with variable rate | payment           3            
Common Stock | Private Exchange Offer and Consent Solicitation                        
Debt Instrument [Line Items]                        
Debt conversion, shares issued | shares           3.5 1.1          
PIK Interest | September Exchange and Consent Solicitation | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021                        
Debt Instrument [Line Items]                        
Stated interest rate           1.00%            
Basis spread on variable rate           9.00%            
Term Loan | Line of Credit                        
Debt Instrument [Line Items]                        
Deferred finance costs, net                 300,000      
Term Loan | Line of Credit | Multidraw Term Loan Agreement                        
Debt Instrument [Line Items]                        
Principal amount                 $ 50,000,000 $ 0    
Long-term debt     $ 50,000,000                  
Extinguishment of debt, amount $ 50,000,000                      
Term Loan | Line of Credit | Loan Agreement                        
Debt Instrument [Line Items]                        
Repayments of debt     $ 32,500,000