Accumulated Comprehensive Loss Components Of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Equity [Abstract]
Foreign currency translation adjustments	$ 2,391	$ 2,155	$ 1,540
Deferred loss on cash flow hedge	(6,607)	(7,469)	(8,331)
Changes in pension benefit obligation recognized in other comprehensive income (loss)	0	(1,487)	(401)
Total accumulated other comprehensive loss	$ (4,216)	$ (6,801)	$ (7,192)