Comprehensive Income Components Of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Equity [Abstract]
Foreign currency translation adjustments	$ 2,155	$ 1,540	$ 275
Deferred loss on cash flow hedge	(7,469)	(8,331)	0
Changes in pension benefit obligation recognized in other comprehensive income (loss)	(1,487)	(401)	58
Total accumulated other comprehensive income (loss)	$ (6,801)	$ (7,192)	$ 333