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Equity (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accumulated other comprehensive income (loss) reflected in the Company's shareholders' equity    
Unrealized gains on available-for-sale securities $ 1,092 $ 867
Unrealized gains on cash flow hedges 718 607
Unrealized losses on cumulative translation adjustment (3,274) (2,659)
Accumulated other comprehensive income (loss) $ (1,464) $ (1,185)