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Long-Term Debt - Exchange Offer and Consent Solicitation (Details) - USD ($)
shares in Millions
6 Months Ended
Feb. 17, 2016
Jun. 30, 2016
Jun. 30, 2015
Jan. 14, 2016
Dec. 31, 2015
Jul. 03, 2013
Aug. 19, 2010
Debt Instrument [Line Items]              
Amortization of financing costs   $ (4,808,000) $ 0        
Senior Notes | 10% Senior Unsecured Notes due 2017              
Debt Instrument [Line Items]              
Principal amount   135,621,000     $ 350,000,000 $ 200,000,000 $ 150,000,000
Long-term debt $ 135,600,000 $ 134,766,000     $ 347,008,000    
Stated interest rate   10.00%     10.00% 10.00% 10.00%
Senior Notes | 10% Senior Secured Notes due 2021              
Debt Instrument [Line Items]              
Principal amount   $ 144,674,000     $ 0    
Long-term debt   $ 156,524,000     $ 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]              
Gain on extinguishment of debt 0            
Debt conversion, original debt, amount $ 214,400,000            
Debt conversion, original debt, percent of total 61.00%            
Private Exchange Offer and Consent Solicitation | Senior Notes | 10% Senior Secured Notes due 2021              
Debt Instrument [Line Items]              
Excess of future undiscounted cash flows $ 13,900,000 $ 13,000,000          
Amortization of financing costs   $ (900,000)          
Stated interest rate       10.00%      
Debt conversion, amount $ 144,700,000            
Common Stock | Private Exchange Offer and Consent Solicitation              
Debt Instrument [Line Items]              
Debt conversion, shares issued 1.1