INDEBTEDNESS - Summary of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal Amount	$ 1,332,631	$ 1,337,256
Discount	(19,105)	(20,071)
Debt Issuance Costs	(28,891)	(30,689)
Total	1,284,635	1,286,496
Less: current portion	(9,250)	(9,250)
Total long-term debt	1,275,385	1,277,246
Senior Notes \| First lien term loan
Debt Instrument [Line Items]
Principal Amount	920,375	925,000
Discount	(7,836)	(8,399)
Debt Issuance Costs	(21,295)	(22,825)
Total	891,244	893,776
Senior Notes \| Second lien notes
Debt Instrument [Line Items]
Principal Amount	412,256	412,256
Discount	(11,269)	(11,672)
Debt Issuance Costs	(7,596)	(7,864)
Total	393,391	392,720
Senior Notes \| ABL facility
Debt Instrument [Line Items]
Principal Amount	0	0
Discount	0	0
Debt Issuance Costs	0	0
Total	$ 0	$ 0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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