Components of Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Components of lease expense:
Operating lease expense	$ 1,767	$ 1,926	$ 3,549	$ 3,956
Less sublease income	53	63	107	186
Net lease expense	1,714	1,863	3,442	3,770
Cash flows information related to leases:
Operating cash outflow from operating leases	$ 1,731	$ 1,829	$ 3,478	$ 3,469