LONG-TERM DEBT - Schedule of Debt (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total	$ 1,712,873,000
Current amount of long-term debt	(16,377,000)	$ 0
Deferred financing costs (excludes the revolving credit)	(18,082,000)	(17,037,000)
Total long-term debt, net of current debt	1,697,114,000	1,872,203,000
Outstanding standby letters of credit	5,862,000	5,862,000
7.250% senior unsecured notes, due October 17, 2024
Debt Instrument [Line Items]
Total debt before deferred financing costs	400,000,000	400,000,000
Plus unamortized premium	11,732,000	14,158,000
Total	411,732,000	414,158,000
6.500% notes, due May 1, 2027
Debt Instrument [Line Items]
Total debt before deferred financing costs	425,000,000	0
Plus unamortized premium	5,000,000	0
Total	430,000,000	0
Revolver
Debt Instrument [Line Items]
Plus unamortized premium	1,968,000	2,470,000
Total	888,968,000	1,474,170,000
Revolver | Revolver
Debt Instrument [Line Items]
Total debt before deferred financing costs	117,000,000	180,000,000
Revolver | Term B-1 Loan, due November 17, 2024
Debt Instrument [Line Items]
Total debt before deferred financing costs	0	1,291,700,000
Revolver | Term B-2 Loan, due November 17, 2024
Debt Instrument [Line Items]
Total debt before deferred financing costs	770,000,000	0
Other Debt
Debt Instrument [Line Items]
Total	873,000	912,000
Total Debt Before Financing Costs
Debt Instrument [Line Items]
Total	$ 1,731,573,000	$ 1,889,240,000