Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Comprehensive Income (Loss) [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 427		$ 853
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(103)		(282)
Defined benefit pension plan adjustments, Net-of-Tax Amount	324		571
Foreign currency translation adjustment, Before-Tax Amount	(396)	$ (1,877)	1,208	$ (2,841)
Foreign currency translation adjustment, Tax (Expense) Benefit	138	731	(536)	1,107
Foreign currency translation adjustment, Net-of-Tax Amount	(258)	(1,146)	672	(1,734)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount	(271)	(122)	(258)	(138)
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit	118	48	113	54
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount	(153)	(74)	(145)	(84)
Unrealized gain (loss) in fair value of interest rate swap, Before-Tax Amount	17	99	(45)	173
Unrealized gain (loss) in fair value of interest rate swap, Tax (Expense) Benefit	(6)	(39)	21	(68)
Unrealized gain (loss) in fair value of interest rate swap, Net-of-Tax Amount	11	60	(24)	105
Total other comprehensive income (loss), Before-Tax Amount	(223)	(1,900)	1,758	(2,806)
Total other comprehensive income (loss), Tax (Expense) Benefit	147	740	(684)	1,093
Total other comprehensive (loss) income, net of tax	$ (76)	$ (1,160)	$ 1,074	$ (1,713)