LONG-TERM DEBT - Long Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt before deferred financing costs	$ 1,845,529	$ 1,731,573
Current amount of long-term debt	(5,488)	(16,377)
Deferred financing costs (excludes the revolving credit)	(17,222)	(18,082)
Total long-term debt	1,822,819	1,697,114
Outstanding standby letters of credit	6,251	5,862
Revolver
Debt Instrument [Line Items]
Carrying value of debt	243,749	117,000
Term B-2 Loan, due November 17, 2024
Debt Instrument [Line Items]
Carrying value of debt	758,122	770,000
Plus unamortized premium	1,896	1,968
Total Credit Facility
Debt Instrument [Line Items]
Total debt before deferred financing costs	1,003,767	888,968
6.500% notes due May 1, 2027
Debt Instrument [Line Items]
Carrying value of debt	425,000	425,000
Plus unamortized premium	4,830	5,000
Total debt before deferred financing costs	$ 429,830	430,000
Debt instrument, stated percentage	6.50%
7.25% senior unsecured notes, due November 1, 2024
Debt Instrument [Line Items]
Carrying value of debt	$ 400,000	400,000
Plus unamortized premium	11,125	11,732
Total debt before deferred financing costs	$ 411,125	411,732
Debt instrument, stated percentage	7.25%
Other debt
Debt Instrument [Line Items]
Total debt before deferred financing costs	$ 807	$ 873

Debt Issuance Cost, Net, Excluding Revolving Credit

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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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Amount, after accumulated amortization, of debt premium.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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