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Stock-Based Compensation - Narrative (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Approved and authorized maximum number of shares to be issued 3,000,000    
Compensation expense related to stock based awards outstanding $ 582,000 $ 774,000  
Options granted during period   262,051  
Fair value of options granted during period, per share   $ 4.08  
Proceeds received upon exercise of stock options 206,000 13,000  
Exercise of stock options, shares 33,966 2,226 2,226
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 4,600,000    
Share-based compensation cost not yet recognized, period for recognition 2 years 8 months 23 days    
Stock options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, expiration period 10 years    
Minimum | Stock options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, vesting period 3 years    
Maximum | Stock options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, vesting period 5 years