International Retirement Plan (Reconciliation of Changes In Projected Benefit Obligation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of benefit obligations:
Obligations as of January 1	$ 8,434	$ 7,727
Service cost	155	184
Interest cost	148	131
Actuarial loss (gain)	453	(555)
Benefit payments	(145)	(136)
Effect of foreign currency exchange rate changes	(387)	1,083
Benefit obligations as of December 31	8,658	8,434
Fair value of assets as of December 31	3,224	3,207
Funded status as of December 31, net of tax benefit	$ (5,434)	$ (5,227)