Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other Comprehensive Income (Loss) [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 427
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(180)
Defined benefit pension plan adjustments, Net-of-Tax Amount	247
Foreign currency translation adjustment, Before-Tax Amount	1,604	$ (964)
Foreign currency translation adjustment, Tax (Expense) Benefit	(674)	376
Foreign currency translation adjustment, Net-of-Tax Amount	930	(588)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount	13	(16)
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit	(5)	6
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount	8	(10)
Unrealized gain (loss) in fair value of interest rate swap, Before-Tax Amount	(62)	74
Unrealized gain (loss) in fair value of interest rate swap, Tax (Expense) Benefit	27	(29)
Unrealized gain (loss) in fair value of interest rate swap, Net-of-Tax Amount	(35)	45
Total other comprehensive income (loss), Before-Tax Amount	1,982	(906)
Total other comprehensive income (loss), Tax (Expense) Benefit	(832)	353
Total other comprehensive (loss) income, net of tax	$ 1,150	$ (553)