Equity And Stock-Based Compensation (Schedule Of Accumulated Other Comprehensive Income) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Total Stockholders' Equity [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ 28,039	[1]
Net current-period other comprehensive income	(16,233)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	11,806
Foreign Currency Items [Member]
Total Stockholders' Equity [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	31,084
Net current-period other comprehensive income	(16,442)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	14,642
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Total Stockholders' Equity [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	10
Net current-period other comprehensive income	2
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	12
Accrued Pension Service Costs [Member]
Total Stockholders' Equity [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(3,055)
Net current-period other comprehensive income	207
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ (2,848)

[1] Certain prior period amounts have been reclassified to conform to the current period presentation (see Note 2 - Significant Accounting Policies - Reclassifications).