INDEBTEDNESS - Summary of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Principal Amount	$ 1,325,000	$ 551,513
Discount	(20,557)	(1,062)
Debt Issuance Costs	(38,045)	(11,076)
Total	1,266,398	539,375
Less: current portion	(6,938)	(4,150)
Total long-term debt	1,259,460	535,225
Senior Notes \| First Lien Term Loan
Debt Instrument [Line Items]
Principal Amount	925,000	401,513
Discount	(8,681)	(1,062)
Debt Issuance Costs	(23,590)	(5,678)
Total	892,729	394,773
Senior Notes \| Second Lien Notes
Debt Instrument [Line Items]
Principal Amount	400,000	150,000
Discount	(11,876)	0
Debt Issuance Costs	(14,455)	(5,398)
Total	373,669	144,602
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 issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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