Leases - Components of Lease Expense (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	$ 1,924	$ 2,231	$ 5,700	$ 7,042
Finance lease cost
Amortization of ROU assets	2	49	6	235
Interest on lease liabilities	1	2	4	5
Total finance lease cost	$ 3	$ 51	$ 10	$ 240