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Stock-Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Plan
Stock-Based Compensation (Additional Textual) [Abstract]  
Number of stock based compensation plan 1
Unrecognized compensation cost related to unvested awards $ 7.6
2005 Stock Incentive Plan [Member]
 
Stock-Based Compensation (Textual) [Abstract]  
Total aggregate number of shares of common stock that may be issued 3,150,000