Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Schedule of Debt (Details)

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LONG-TERM DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Principal Balance $ 843,878 $ 835,140
Unamortized Net Discount 12,491 13,237
Debt Issuance Costs, Net (17,139) (18,173)
Long-term Debt, Net 839,229 830,203
Revolving Credit Facility    
Debt Instrument [Line Items]    
Principal Balance 147,000 140,000
Unamortized Net Discount 0 0
Debt Issuance Costs, Net 0 0
Long-term Debt, Net 147,000 140,000
Revolving Credit Facility | Other Noncurrent Assets, Net    
Debt Instrument [Line Items]    
Debt Issuance Costs, Net (4,900) (5,100)
Second Lien Notes due 2023    
Debt Instrument [Line Items]    
Principal Balance 696,878 695,140
Unamortized Net Discount 12,491 13,237
Debt Issuance Costs, Net (17,139) (18,173)
Long-term Debt, Net $ 692,229 $ 690,203