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Stock-Based Compensation - Narrative (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Approved and authorized maximum number of shares to be issued 3,000,000   3,000,000  
Compensation expense related to stock based awards outstanding $ 501,000 $ 846,000 $ 1,637,000 $ 2,372,000
Options granted during period 15,081      
Fair value of options granted during period, per share $ 4.31      
Proceeds received upon exercise of stock options 231,000 162,200 737,000,000 175,200
Exercise of stock options, shares 38,507 33,513 135,607 35,739
Total unrecognized compensation expense $ 3,700,000   $ 3,700,000  
Share-based compensation cost not yet recognized, period for recognition     2 years 10 months 24 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