Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease cost	$ 4,836	$ 4,565	$ 14,224	$ 13,424
Variable lease cost	1,082	1,016	2,970	2,898
Short-term lease cost	4	20	15	27
Total operating lease cost	5,922	5,601	17,209	16,349
Payments for rent	$ 4,619	$ 4,386	$ 13,588	$ 12,857