Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 6,671	$ 5,640	$ 13,021	$ 11,212
Finance lease cost
Amortization of leased assets	781	941	1,573	1,906
Interest on finance lease obligations	52	70	107	143
Total lease costs	7,504	6,651	14,701	13,261
Operating Lease
Finance lease cost
Variable lease costs	800	600	1,500	1,200
Short-term lease costs	300	200	500	400
Finance Lease
Finance lease cost
Variable lease costs	$ 200	$ 200	$ 400	$ 400