LONG-TERM DEBT (Details) $ in Thousands				3 Months Ended	12 Months Ended
	Apr. 05, 2021 USD ($)	Mar. 18, 2021 USD ($)	Oct. 02, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 15, 2021 USD ($)
Debt
Total long-term debt and finance leases				$ 1,996,161	$ 2,164,557	$ 1,996,161
Less: current portion of long-term debt and finance leases				(17,561)	(7,959)	(17,561)
Less: deferred debt issuance costs			$ (29,100)	(45,934)	(37,745)	(45,934)
Total long-term debt				1,932,666	2,118,853	1,932,666
Less: current portion of long-term debt				(17,561)	(7,959)	(17,561)
Total long-term debt				1,932,666	2,118,853	1,932,666
Unamortized discount					$ 10,308
Leverage ratio			3.70		4.14
Interest rate (as a percent)					5.00%
Amortization of deferred financing costs and discounts					$ 15,622	7,871	$ 4,932
Dividend declared							27,865
Repayment of debt					397,000	1,867,838	195,350
Repayments of long-term debt						444,717	49,804
Gain (loss) on extinguishment of debt				(18,500)	$ (17,101)	(18,264)	4,510
Maximum
Debt
Leverage ratio for an event of default					5.85
Senior Secured Credit Facility
Debt
Gain (loss) on extinguishment of debt						$ (12,300)
Senior Secured Credit Facility | Weighted average
Debt
Weighted average interest rate (as a percent)					4.25%	5.75%
Term Loans
Debt
Total long-term debt and finance leases				1,228,694	$ 989,567	$ 1,228,694
Unamortized discount				18,181	10,308	18,181
Aggregate principal amount			$ 1,250,000
Interest rate (as a percent)			4.75%
Quarterly principal payments required						3,100
Issue discount (as a percentage)			1.50%
Variable rate basis, floor (as a percent)			1.00%
Original issuance discount			$ 18,800
Repayment of debt		$ 397,000
Gain (loss) on extinguishment of debt					(12,000)
Senior secured credit facility - revolving loan
Debt
Maximum borrowing capacity of credit facility			$ 250,000
Leverage ratio			3.20
Amounts outstanding				0	0	0
Stand-by letter of credit outstanding					25,100
Available borrowing capacity					$ 224,900
Senior secured credit facility - revolving loan | LIBOR | Maximum
Debt
Margin (as a percent)					4.00%
Senior secured credit facility - revolving loan | Alternate base rate | Maximum
Debt
Margin (as a percent)					3.00%
Finance leases
Debt
Total long-term debt				17,467	$ 24,990	17,467
Incremental Term Loan Facility
Debt
Aggregate principal amount								$ 150,000
Incremental Term Loan Facility | Maximum
Debt
Additional borrowing capacity			$ 300,000
6.50% senior secured notes due 2028
Debt
Total long-term debt				$ 750,000	750,000	750,000
Aggregate principal amount			$ 750,000
Interest rate (as a percent)			6.50%
Amortization of deferred financing costs and discounts			$ 17,000
5.00% senior secured notes due 2028
Debt
Total long-term debt					400,000
Aggregate principal amount		$ 400,000
Interest rate (as a percent)		5.00%
Amortization of deferred financing costs and discounts		$ 3,800
6.50% senior secured notes due 2022
Debt
Interest rate (as a percent)			6.50%
Amount of debt redeemed			$ 440,500
Repurchase amount of the aggregate principal							$ 55,000
Gain (loss) on extinguishment of debt						$ (5,900)
Redemption of principle (in Percent)			100.00%
Second Amendment
Debt
Aggregate principal amount	$ 999,900
Interest rate (as a percent)	3.50%
Variable rate basis, floor (as a percent)	0.75%
Gain (loss) on extinguishment of debt					$ (5,100)