Leases - Components of Net Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finance leases:
Amortization of right-of-use assets	$ 384	$ 497
Interest on lease liabilities	57	67
Operating lease cost	1,305	1,290
Short-term lease cost	119	109
Variable lease cost	307	347
Sublease income	(76)	(99)
Net lease cost	$ 2,096	$ 2,211