Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 890,000	$ 772,101
Unamortized discount and debt issuance costs	(23,733)	(22,164)
Total debt, net of discount and debt issuance costs	866,267	749,937
Less current maturities of long-term debt	(5,961)	(22,007)
Total long-term debt, net of current	860,306	727,930
Secured Debt | First Term Loan
Debt Instrument [Line Items]
Total debt	890,000	506,772
Secured Debt | Second Term Loan
Debt Instrument [Line Items]
Total debt	0	265,329
Line of Credit | Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	$ 0	$ 0