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 expense	$ 4,004	$ 3,841	$ 12,388	$ 11,240
Finance lease expense:
Amortization of assets	5	209	218	627
Interest on lease liabilities		4	1	17
Short-term lease expense	234	99	725	315
Variable lease expense	1,193	726	3,483	2,175
Total lease expense	$ 5,436	$ 4,879	$ 16,815	$ 14,374