Derivative Instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Foreign Exchange Forward Contract Derivatives in cash flow hedging relationships [Member]
       
Foreign Exchange Forward Contract Derivatives in cash flow hedging relationships:        
Net gain (loss) recognized in OCI (a) $ (690) $ 41 $ (110) $ 66
Net gain (loss) recognized from accumulated OCI into net loss (b) (105) 242 (181) 535
Net gain (loss) recognized in net loss (c) (1) 15 (5) 55
Foreign Exchange Forward Contract Derivatives not designated as hedging relationships [Member]
       
Foreign Exchange Forward Contract Derivatives not designated as hedging relationships:        
Net loss recognized in net loss (d) $ (33)   $ 16