Pensions (Components Of Net Periodic Pension Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,022	$ 869	$ 768
Interest cost	4,942	4,882	4,791
Expected return on assets	(6,669)	(5,615)	(3,822)
Prior service cost	75	117	203
Net amortization	1,728	1,405	1,942
Net periodic pension cost	1,098	1,658	3,882
European Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	155	493	482
Interest cost	1,947	1,773	1,888
Expected return on assets	(1,442)	(1,283)	(1,211)
Net amortization	68	148	171
Special termination benefits	200
Net periodic pension cost	$ 928	$ 1,131	$ 1,330