Commitments and Contingencies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2003
Commitments and Contingencies
Operating Lease, Right-of-Use Asset	$ 6,100,000	$ 6,600,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Operating Lease, Liability	$ 6,426,000	$ 6,900,000
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current, Other Liabilities, Noncurrent	Accrued Liabilities, Current, Other Liabilities, Noncurrent
Additional lease assets recorded	$ 1,039,000
Operating Lease, Payments	1,777,000	$ 1,737,000
Lease, Cost	$ 1,765,000	$ 1,752,000	$ 1,801,000
Option to extend	true
Operating Lease, Weighted Average Remaining Lease Term		6 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent		4.20%
Contingent cash payment				$ 1,000,000