Leases - Schedule of Operating Lease Costs (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 (gross lease expense)	$ 3,249	$ 3,301	$ 9,892	$ 10,179
Variable lease costs	1,339	1,365	3,491	4,382
Sublease income (including reimbursed expenses)	$ 1,218	$ 1,357	$ 3,782	$ 3,936