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Stock-Based Compensation - Narrative (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 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 $ 548,000   $ 753,000 $ 1,132,000 $ 1,526,000
Options granted during period 20,000 262,051      
Fair value of options granted during period, per share $ 3.95 $ 4.08      
Proceeds received upon exercise of stock options 302,000     510,000,000 13,000
Exercise of stock options, shares 63,134   0 97,100 2,226
Total unrecognized compensation expense $ 4,300,000     $ 4,300,000  
Share-based compensation cost not yet recognized, period for recognition       3 years 15 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