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Additional Information to Stock Options Activity (Details) (Restricted Stock Units, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock Units
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Intrinsic value $ 13,983 $ 6,159 $ 2,068
Income tax benefit $ 2,049 $ 799 $ 99