Leases (Summary Of Lease Costs By Type) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Amortization of right-of-use assets	$ 103
Interest on lease liabilities	10
Operating lease cost	1,862
Variable lease cost	564	[1]
Total lease cost	$ 2,539

[1] Variable lease costs consists primarily of taxes, insurance, and common area or other maintenance costs for our domestic and foreign building leases.