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Stock-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Summary of the activity in the Company's Prior Plan    
Outstanding at December 31,2011, Number of Options 620,000  
Outstanding at December 31,2011, Weighted Average Exercise price $ 2.97  
Exercised, Number of stock options (217,003) (145,200)
Exercised, Weighted-Average Exercise Price $ 3.33  
Outstanding at June 30, 2012, Number of Options 402,997  
Outstanding at June 30, 2012, Weighted-Average Exercise Price $ 2.78  
Outstanding at June 30, 2012, Weighted-Average Remaining Contractual Term 5 years 3 months 18 days  
Outstanding at June 30, 2012, Aggregate Intrinsic Value $ 5,971  
Exercisable at June 30, 2012, Number of Options 382,997  
Exercisable at June 30, 2012, Weighted-Average Exercise Price $ 2.60  
Exercisable at June 30, 2012, Weighted-Average Remaining Contractual Term 5 years 1 month 6 days  
Exercisable at June 30, 2012, Aggregate Intrinsic Value $ 5,745