Commitments and Contingencies (Lease Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies
Operating cash flows from operating Leases	$ 4,446	$ 4,491	$ 3,531
Operating cash flows from finance leases	25	33	46
Financing cash flows from finance leases	310	369	354
Right-of use assets obtained in exchange for lease obligations: Operating leases	11,041	4,819	7,978
Right-of use assets obtained in exchange for lease obligations: Finance leases	$ 110	$ 61	$ 143
Weighted-average remaining lease term (years), Operating leases	10 years	8 years 8 months 12 days	8 years 1 month 6 days
Weighted-average remaining lease term (years), Finance leases	2 years	2 years 3 months 18 days	2 years 9 months 18 days
Weighted-average discount rate, Operating leases	4.50%	5.20%	5.90%
Weighted-average discount rate, Finance leases	5.20%	5.00%	4.60%