LONG-TERM DEBT - Long Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt before deferred financing costs	$ 1,765,771	$ 1,709,846
Current amount of long-term debt	0	(5,488)
Deferred financing costs (excludes the revolving credit)	(18,823)	(14,409)
Total long-term debt, net of current debt	1,746,948	1,689,949
Outstanding standby letters of credit	6,069	6,229
Credit Facility
Debt Instrument [Line Items]
Plus unamortized premium	1,467	1,681
Total debt before deferred financing costs	721,200	870,414
Credit Facility \| Revolver
Debt Instrument [Line Items]
Carrying value of debt	42,727	114,727
Credit Facility \| Term B-2 Loan, due November 17, 2024
Debt Instrument [Line Items]
Carrying value of debt	677,006	754,006
Senior Notes \| 6.500% notes due May 1, 2027
Debt Instrument [Line Items]
Carrying value of debt	425,000	425,000
Plus unamortized premium	3,807	4,318
Total debt before deferred financing costs	$ 428,807	429,318
Debt instrument, stated percentage (percent)	6.50%
Senior Notes \| 6.750% notes due March 31, 2029
Debt Instrument [Line Items]
Carrying value of debt	$ 540,000	0
Total debt before deferred financing costs	$ 540,000	0
Debt instrument, stated percentage (percent)	6.75%
Senior Notes \| 7.25% senior unsecured notes, due November 1, 2024
Debt Instrument [Line Items]
Carrying value of debt	$ 0	400,000
Plus unamortized premium	0	9,306
Total debt before deferred financing costs	$ 0	409,306
Debt instrument, stated percentage (percent)	7.25%
Accounts receivable facility
Debt Instrument [Line Items]
Carrying value of debt	$ 75,000	0
Other debt
Debt Instrument [Line Items]
Total debt before deferred financing costs	$ 764	$ 808

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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