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Stockholders' Equity (Summary of Option activity under the Stock Option Plan) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding, beginning (Shares) 1,087
Exercised (Shares) (188)
Forfeited (Shares) (5)
Expired (Shares) (11)
Outstanding, ending (Shares) 883
Exercisable (Shares) 810
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price [Rollforward]  
Oustanding, beginning (Weighted Average Exercise Price) $ 7.27
Exercised (Weighted Average Exercise Price) $ 7.26
Forfeited (Weighted Average Exercise Price) $ 6.93
Expired (Weighted Average Exercise Price) $ 6.14
Oustanding, ending (Weighted Average Exercise Price) $ 7.29
Exercisable (Weighted Average Exercise Price) $ 7.33
Outstanding, Weighted Average Contractual Term 3 years 9 months
Exercisable, Weighted Average Contractual Term 3 years 6 months
Outstanding, Aggregated Intrinsic Value $ 1,124
Exercisable, Aggregated Intrinsic Value $ 1,008