Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 11,806	[1],[2]
Net current-period other comprehensive income	269
Balance	12,075
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	14,642
Net current-period other comprehensive income	142
Balance	14,784
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	12
Net current-period other comprehensive income	(2)
Balance	10
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,848)
Net current-period other comprehensive income	129
Balance	$ (2,719)

[1] Certain 2015 balances have been reclassified to conform to the 2016 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).

[2] Certain 2015 balances included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).