Long-Term Debt - Outstanding amounts and available borrowings under Senior Secured Credit Facilities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Long-term debt
Long-term Debt	$ 1,384,207	$ 1,393,573
Less: current portion	(15,827)	(15,822)
Long-term debt, net of current portion	1,368,380	1,377,751
Senior Secured Credit Facilities
Long-term debt
Less: outstanding letters of credit	(4,900)	(4,900)
Term Loan Facility.
Long-term debt
Maximum borrowing capacity	1,400,000	1,400,000
Less: cumulative principal payments	(19,515)	(9,004)
Less: unamortized original issue discount	(15,177)	(16,826)
Less: unamortized finance costs	(6,078)	(6,893)
Long-term Debt	1,359,230	1,367,277
Less: current portion	(14,015)	(14,015)
Long-term debt, net of current portion	$ 1,345,215	$ 1,353,262
Interest rate (as a percent)	5.34%	3.25%
Revolving Credit Facility
Long-term debt
Maximum borrowing capacity	$ 65,000	$ 65,000
Less: outstanding letters of credit	(4,930)	(4,930)
Additional borrowing capacity	$ 60,070	$ 60,070