Components of Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components of lease expense:
Operating lease expense	$ 1,748	$ 1,832	$ 5,297	$ 5,788
Less sublease income	53	53	160	239
Net lease expense	1,695	1,779	5,137	5,549
Cash flows information related to leases:
Operating cash outflow from operating leases	$ 1,714	$ 1,796	$ 5,192	$ 5,265