LONG-TERM DEBT - Long Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt before deferred financing costs	$ 1,743,028	$ 1,709,846
Current amount of long-term debt	0	(5,488)
Deferred financing costs (excludes the revolving credit)	(16,932)	(14,409)
Total long-term debt, net of current debt	1,726,096	1,689,949
Outstanding standby letters of credit	6,069	6,229
Credit Facility \| Revolver
Debt Instrument [Line Items]
Carrying value of debt	94,727	114,727
Credit Facility \| Term B-2 Loan, due November 17, 2024
Debt Instrument [Line Items]
Carrying value of debt	677,006	754,006
Plus unamortized premium	1,538	1,681
Credit Facility \| Total Credit Facility
Debt Instrument [Line Items]
Total debt before deferred financing costs	773,271	870,414
Notes \| 6.500% notes due May 1, 2027
Debt Instrument [Line Items]
Carrying value of debt	425,000	425,000
Plus unamortized premium	3,977	4,318
Total debt before deferred financing costs	$ 428,977	429,318
Debt instrument, stated percentage (percent)	6.50%
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
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%
Other debt
Debt Instrument [Line Items]
Total debt before deferred financing costs	$ 780	$ 808

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