Derivative Financial Instruments Derivatives Not Designated as Hedging Relationships (Details) (Other Income (Expense) [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Income (Expense) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Foreign exchange forward contracts	$ (145)	$ (422)	$ (2,022)