Leases (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	$ 2,179	$ 2,181	$ 6,491	$ 6,539
Variable lease costs	270	382	760	672
Net lease cost	$ 2,449	$ 2,563	$ 7,251	$ 7,211