Derivatives (Gains and Losses for Derivatives that were Not Designated as Hedging Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative [Line Items]
Gain and losses for derivatives not designated as hedging instruments	$ (190)	$ 934	$ (220)	$ 608
Other Income (Expense) [Member] | Currency contracts [Member]
Derivative [Line Items]
Gain and losses for derivatives not designated as hedging instruments	$ (190)	$ 934	$ (220)	$ 608