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]
Amortization of right-of-use assets	$ 35	$ 35	$ 105	$ 104
Interest on lease liabilities	7	9	22	28
Operating lease cost	2,610	2,729	8,375	9,824
Short-term lease cost	86	4	120	238
Total lease cost	$ 2,738	$ 2,777	$ 8,622	$ 10,194