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Equity (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accumulated other comprehensive income (loss) reflected in the Company's shareholders' equity    
Unrealized gains on available-for-sale securities $ 867 $ 589
Unrealized gains on cash flow hedges 607 1,986
Unrealized losses on cumulative translation adjustment (2,659) (2,903)
Accumulated other comprehensive income (loss) $ (1,185) $ (328)