International Retirement Plan (Reconciliation of Changes In Projected Benefit Obligation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of benefit obligations:
Obligations as of January 1	$ 10,497	$ 8,658
Service cost	204	166	$ 155
Interest cost	84	151	148
Actuarial loss (gain)	(1,222)	1,815
Benefit payments	(151)	(139)
Effect of foreign currency exchange rate changes	979	(154)
Benefit obligations as of December 31	10,391	10,497	$ 8,658
Fair value of assets as of December 31	3,844	3,343
Funded status as of December 31, net of tax benefit	$ (6,547)	$ (7,154)