Debt and Other Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt and Other Obligations
Total debt before unamortized discount and debt issuance costs	$ 513,180	$ 510,492
Unamortized discount and debt issuance costs, net	(6,201)	(7,395)
Total debt	506,979	503,097
Total current portion of long-term debt	11,700	10,085
Long-term debt	495,279	493,012
Term Loan B
Debt and Other Obligations
Total debt before unamortized discount and debt issuance costs	487,325	491,113
Total current portion of long-term debt	5,050	5,050
Seller Notes
Debt and Other Obligations
Total debt before unamortized discount and debt issuance costs	18,626	11,510
Total current portion of long-term debt	5,770	4,060
Deferred payment obligation
Debt and Other Obligations
Total debt before unamortized discount and debt issuance costs	4,000	4,000
Finance lease liabilities and other
Debt and Other Obligations
Total debt before unamortized discount and debt issuance costs	3,229	3,869
Total current portion of long-term debt	$ 880	$ 975