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Shareholders Equity (Details 1) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of Stock option      
Beginning balance of outstanding shares 1,174 1,183  
Beginning Balance of Outstanding Weighted Average Exercise Price $ 4.74 $ 4.64  
Outstanding, Weighted Average Remaining Contractual Term 6 years 9 months 18 days 7 years 3 months 18 days 7 years 10 months 24 days
Granted, Shares 163 95  
Granted, Weighted Average Exercise Price $ 7.96 $ 5.48  
Forfeitures, Shares (52) (56)  
Forfeitures, Weighted Average Exercise Price $ 5.87 $ 5.86  
Exercised, Shares (41) (48)  
Exercised, Weighted Average Exercise Price $ 5.95 $ 2.51  
Ending balance of outstanding, shares 1,244 1,174 1,183
Ending Balance of Outstanding Weighted Average Exercise Price $ 5.18 $ 4.74 $ 4.64
Outstanding, Aggregate Intrinsic Value $ 6,198 $ 1,710  
Exercisable, Shares 614 480  
Exercisable, Weighted Average Exercise Price $ 5.36 $ 5.73  
Exercisable, Weighted Average Remaining Contractual Term 5 years 10 months 24 days 6 years  
Exercisable, Aggregate Intrinsic Value $ 3,086 $ 658