Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Schedule of Debt (Details)

v3.19.2
LONG-TERM DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Principal Balance $ 861,491 $ 835,140
Unamortized Net Discount 11,566 13,237
Debt Issuance Costs, Net (15,860) (18,173)
Long-term Debt, Net 857,198 830,203
Revolving Credit Facility    
Debt Instrument [Line Items]    
Principal Balance 173,000 140,000
Unamortized Net Discount 0 0
Debt Issuance Costs, Net 0 0
Long-term Debt, Net 173,000 140,000
Revolving Credit Facility | Other Noncurrent Assets, Net    
Debt Instrument [Line Items]    
Debt Issuance Costs, Net (4,700) (5,100)
Second Lien Notes due 2023    
Debt Instrument [Line Items]    
Principal Balance 688,491 695,140
Unamortized Net Discount 11,566 13,237
Debt Issuance Costs, Net (15,860) (18,173)
Long-term Debt, Net $ 684,198 $ 690,203