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Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 7 Months Ended 13 Months Ended 16 Months Ended 22 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2019
Debt Instrument [Line Items]                
Less: unamortized discount $ (61,604)   $ (61,604)   $ (64,491) $ (61,604) $ (64,491) $ (61,604)
Less: unamortized debt issuance costs (355)   (355)   (422) (355) (422) (355)
Total long-term debt 260,527   260,527   245,966 260,527 245,966 260,527
Less: current portion of long-term debt 0   0   0 0 0 0
Total long-term portion 260,527   260,527   245,966 260,527 245,966 260,527
Noncash interest paid in kind     7,788 $ 6,138        
5.00% / 7.00% Second Lien Notes due August 31, 2022                
Debt Instrument [Line Items]                
5.00% / 7.00% Second Lien Notes due August 31, 2022 $ 187,048   $ 187,048   180,894 $ 187,048 180,894 187,048
Noncash interest paid in kind             12,217 $ 18,604
5.00% / 7.00% Second Lien Notes due August 31, 2022 | Minimum                
Debt Instrument [Line Items]                
Stated interest rate (as a percent) 5.00%   5.00%     5.00%   5.00%
5.00% / 7.00% Second Lien Notes due August 31, 2022 | Maximum                
Debt Instrument [Line Items]                
Stated interest rate (as a percent) 7.00%   7.00%     7.00%   7.00%
Less: unvested restricted Second Lien Notes                
Debt Instrument [Line Items]                
Less: unvested restricted Second Lien Notes $ (826)   $ (826)   (1,378) $ (826) (1,378) $ (826)
Line of Credit | Floating rate Revolving A Credit Facility due February 28, 2022                
Debt Instrument [Line Items]                
Line of credit 111,988   111,988   108,488 111,988 108,488 111,988
Line of Credit | 12.00% Revolving B Credit Facility due February 28, 2022                
Debt Instrument [Line Items]                
Line of credit 24,276   24,276   22,875 24,276 22,875 24,276
Total long-term debt $ 24,276   $ 24,276   22,875 $ 24,276 $ 22,875 $ 24,276
Stated interest rate (as a percent) 12.00%   12.00%     12.00%   12.00%
Noncash interest paid in kind $ 715 $ 180 $ 1,401 $ 180 $ 1,375 $ 2,776