Restructuring Charges (Schedule Of Accrued Restructuring Balances) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 2,309	$ 4,009
Restructuring Charges	2,200	4,515	6,724
Cash Payment	(3,790)	(6,024)
Non-Cash Activity		(355)
Foreign Exchange Adjustments	(2)	164
Ending Balance	717	2,309	4,009
2012 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1,793
Cash Payment	(1,097)
Foreign Exchange Adjustments	8
Ending Balance	704
2011 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,853
Restructuring Charges	272	4,858
Cash Payment	(2,102)	(2,668)
Non-Cash Activity		(355)
Foreign Exchange Adjustments	(10)	18
Ending Balance	13	1,853
2010 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	54	2,476
Restructuring Charges	48	(322)	5,825
Cash Payment	(102)	(2,189)
Foreign Exchange Adjustments		89
Ending Balance		54	2,476
2009 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	402	1,533
Restructuring Charges	87	(21)
Cash Payment	(489)	(1,167)
Foreign Exchange Adjustments		57
Ending Balance		402
Severance [Member] | 2012 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1,529
Cash Payment	(998)
Foreign Exchange Adjustments	7
Ending Balance	538
Severance [Member] | 2011 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	189
Restructuring Charges	408	2,386
Cash Payment	(611)	(2,215)
Foreign Exchange Adjustments	14	18
Ending Balance		189
Severance [Member] | 2010 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	34	1,767
Restructuring Charges	(4)	(503)
Cash Payment	(30)	(1,317)
Foreign Exchange Adjustments		87
Ending Balance		34
Lease Facility Costs [Member] | 2012 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	55
Cash Payment	(54)
Foreign Exchange Adjustments	(1)
Lease Facility Costs [Member] | 2011 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,664
Restructuring Charges	(153)	1,958
Cash Payment	(1,474)	(294)
Foreign Exchange Adjustments	(24)
Ending Balance	13	1,664
Lease Facility Costs [Member] | 2009 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	402	1,506
Restructuring Charges	87
Cash Payment	(489)	(1,161)
Foreign Exchange Adjustments		57
Ending Balance		402
Other Exit Costs [Member] | 2012 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	209
Cash Payment	(45)
Foreign Exchange Adjustments	2
Ending Balance	166
Other Exit Costs [Member] | 2011 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	17	514
Cash Payment	(17)	(159)
Non-Cash Activity		(355)
Other Exit Costs [Member] | 2010 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	20	709
Restructuring Charges	52	181
Cash Payment	(72)	(872)
Foreign Exchange Adjustments		2
Ending Balance		20
Other Exit Costs [Member] | 2009 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance		27
Restructuring Charges		(21)
Cash Payment		$ (6)