International Retirement Plan (Reconciliation of Changes In Projected Benefit Obligation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Obligations as of January 1	$ 8,658	$ 8,434
Service cost	166	155	$ 184
Interest cost	151	148	131
Actuarial loss (gain)	1,815	453
Benefit payments	(139)	(145)
Effect of foreign currency exchange rate changes	(154)	(387)
Benefit obligations as of December 31	10,497	8,658	$ 8,434
Fair value of assets as of December 31	3,343	3,224
Funded status as of December 31, net of tax benefit	$ (7,154)	$ (5,434)