Leases (Summary Of Lease Costs By Type) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Amortization of right-of-use assets	$ 25
Interest on lease liabilities	3
Operating lease cost	502
Variable lease cost	144	[1]
Total lease cost	$ 674

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