Leases - Lease Costs and Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost (cost resulting from lease payments)	$ 8,411	$ 7,829
Variable lease cost (cost excluded from lease payments)	971	1,090
Sublease income	(347)	(348)
Net lease cost	9,035	8,571
Operating lease - operating cash flows (fixed payments)	9,232	8,542
Right-of-use assets - operating leases	$ 25,237	$ 27,372
Weighted average lease term - operating leases	6 years 2 months 12 days	4 years 11 months 8 days
Weighted average discount rate - operating leases	4.00%	4.00%