Long-Term Debt and Credit Facilities - Term Loan Repricing (Details) - USD ($) $ in Thousands	Apr. 16, 2019	Jul. 13, 2018	Dec. 31, 2021	Dec. 31, 2020
Long-Term Debt and Credit Facilities.
Outstanding amount of term loans			$ 1,249,227	$ 1,537,956
Proceeds from refinancing term loans	$ 30,000	$ 30,000
First Amendment
Long-Term Debt and Credit Facilities.
Outstanding amount of term loans		$ 343,400
Reduction in interest rate (in percentage)		1.00%
First Amendment | Federal funds rate
Long-Term Debt and Credit Facilities.
Variable interest rate (as a percent)		0.50%
First Amendment | LIBOR
Long-Term Debt and Credit Facilities.
Floor interest rate		1.00%
Variable interest rate (as a percent)		6.50%
First Amendment | One-month adjusted LIBOR
Long-Term Debt and Credit Facilities.
Variable interest rate (as a percent)		1.00%
First Amendment | Base rate
Long-Term Debt and Credit Facilities.
Variable interest rate (as a percent)		5.50%
Senior secured revolving facility
Long-Term Debt and Credit Facilities.
Outstanding amount of term loans		$ 343,400
Maximum debt issuance costs for new lenders exceeded 10% test		100
Senior secured revolving facility | First Amendment
Long-Term Debt and Credit Facilities.
Debt issuance costs		1,000
Amortization expense of debt issuance costs		1,000
Write off of previously recognized debt issuance costs		$ 100