Financial Derivatives (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivative instruments fair value
Derivative assets	$ 2,618	$ 710
Derivative liabilities	7	752
Derivatives Not Designated As Hedging Instruments Under ASC 815 [Member] | Foreign Currency Forward Contracts [Member] | Other Current Assets [Member]
Derivative instruments fair value
Derivative assets	162	6
Derivatives Not Designated As Hedging Instruments Under ASC 815 [Member] | Foreign Currency Forward Contracts [Member] | Other Accrued Expenses and Current Liabilities [Member]
Derivative instruments fair value
Derivative liabilities	1	267
Derivatives Designated As Cash Flow Hedging Instruments Under ASC 815 [Member]
Derivative instruments fair value
Derivative assets	2,456	704
Derivative liabilities	6	485
Derivatives Designated As Cash Flow Hedging Instruments Under ASC 815 [Member] | Foreign Currency Forward Contracts [Member] | Other Current Assets [Member]
Derivative instruments fair value
Derivative assets	1,677	530
Derivatives Designated As Cash Flow Hedging Instruments Under ASC 815 [Member] | Foreign Currency Option Contracts [Member] | Other Current Assets [Member]
Derivative instruments fair value
Derivative assets	779	174
Derivatives Designated As Cash Flow Hedging Instruments Under ASC 815 [Member] | Foreign Currency Option Contracts [Member] | Other Accrued Expenses and Current Liabilities [Member]
Derivative instruments fair value
Derivative liabilities	$ 6	$ 485