Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Components of Long-Term Debt (Details)

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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Principal $ 889,790 $ 889,790
Adjustments to carrying value, Debt premium, discount, issuance costs, net of amortization (3,612) (3,956)
Adjustments to carrying value, Total 100,549 102,262
Adjustments to carrying value, Current maturities 22,858 22,925
Adjustments to carrying value, less current maturities 77,691 79,337
Debt premium, discount, issuance costs, net of amortization (3,612) (3,956)
Total long-term debt 990,339 992,052
Long-term debt 22,858 22,925
Long term debt, less current maturities 967,481 969,127
11.00% 1.5 Lien Term Loan, Due November 2019    
Debt Instrument [Line Items]    
Principal 75,000 75,000
Adjustments to carrying value, Future interest payments 13,539 15,596
Adjustments to carrying value, Subtotal 13,539 15,596
Carrying Value 88,539 90,596
9.00 % Second Lien Term Loan, Due May 2020    
Debt Instrument [Line Items]    
Principal 300,000 300,000
Carrying Value 300,000 300,000
8.50% Unsecured Senior Notes, Due June 2019    
Debt Instrument [Line Items]    
Principal 189,829 189,829
Carrying Value 189,829 189,829
9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020    
Debt Instrument [Line Items]    
Principal 171,769 171,769
Adjustments to carrying value, Future payments-in-kind 5,745 5,745
Adjustments to carrying value, Future interest payments 34,872 34,872
Adjustments to carrying value, Subtotal 40,617 40,617
Carrying Value 212,386 212,386
8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021    
Debt Instrument [Line Items]    
Principal 153,192 153,192
Adjustments to carrying value, Future payments-in-kind 11,323 11,323
Adjustments to carrying value, Future interest payments 38,682 38,682
Adjustments to carrying value, Subtotal 50,005 50,005
Carrying Value $ 203,197 $ 203,197