LONG-TERM DEBT - Long Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Total debt before deferred financing costs	$ 1,798,316	$ 1,821,267
Current amount of long-term debt	0	(22,727)
Deferred financing costs (excludes the revolving credit)	(15,772)	(16,409)
Total long-term debt, net of current debt	1,782,544	1,782,131
Outstanding standby letters of credit	6,069	6,069
Credit Facility
Debt Instrument [Line Items]
Plus unamortized premium	1,326	1,397
Total debt before deferred financing costs	708,741	731,539
Credit Facility \| Revolver
Debt Instrument [Line Items]
Carrying value of debt	75,000	97,727
Credit Facility \| Term B-2 Loan, due November 17, 2024
Debt Instrument [Line Items]
Carrying value of debt	632,415	632,415
Senior Notes \| 6.500% notes due May 1, 2027
Debt Instrument [Line Items]
Carrying value of debt	470,000	470,000
Plus unamortized premium	3,778	3,964
Total debt before deferred financing costs	$ 473,778	473,964
Debt instrument, stated percentage (percent)	6.50%
Senior Notes \| #REF!
Debt Instrument [Line Items]
Carrying value of debt	$ 540,000	540,000
Total debt before deferred financing costs	$ 540,000	540,000
Debt instrument, stated percentage (percent)	6.75%		6.75%
Accounts receivable facility
Debt Instrument [Line Items]
Carrying value of debt	$ 75,000	75,000
Other debt
Debt Instrument [Line Items]
Total debt before deferred financing costs	$ 797	$ 764

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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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