INDEBTEDNESS - Summary of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal Amount	$ 1,161,531	$ 1,337,256
Discount	(13,355)	(20,071)
Debt Issuance Costs	(23,823)	(30,689)
Total	1,124,353	1,286,496
Less: current portion	(9,250)	(9,250)
Total long-term debt	1,115,103	1,277,246
Senior Notes \| First Lien Term Loan
Debt Instrument [Line Items]
Principal Amount	915,750	925,000
Discount	(7,253)	(8,399)
Debt Issuance Costs	(19,710)	(22,825)
Total	888,787	893,776
Senior Notes \| Second Lien Notes
Debt Instrument [Line Items]
Principal Amount	245,781	412,256
Discount	(6,102)	(11,672)
Debt Issuance Costs	(4,113)	(7,864)
Total	235,566	392,720
Senior Notes \| Revolving Credit 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 discount.

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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