Foreign Currency Exchange Rate Risk Foreign Currency Exchange Rate Risk 2 (Details) (Not Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Other Current Assets | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 1,147	$ 245
Other Current Assets | Zero-cost collar options
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Other Current Liabilities | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	383	640
Other Current Liabilities | Zero-cost collar options
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 1,671	$ 0