Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 12,075	[1]
Net current-period other comprehensive income	5,861
Balance	17,936
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	14,784
Net current-period other comprehensive income	5,813
Balance	20,597
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	10
Net current-period other comprehensive income	(4)
Balance	6
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,719)
Net current-period other comprehensive income	52
Balance	$ (2,667)

[1] Certain 2016 balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).