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Stock-based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation     $ 499 $ 423
Reversal of stock-based compensation, actual forfeitures $ 135 $ 230    
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value assumptions, risk free interest rate     1.40% 1.70%
Fair value assumptions, weighted average volatility rate     41.00% 48.00%
Stock options, expected forfeiture rate     11.16% 8.97%
Fair value assumptions, weighted average expected lives     7 years 6 months 7 years 6 months
Options granted in period, weighted average grant date fair value     $ 7.54 $ 5.99
Stock options granted     126,271  
Minimum [Member] | Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price for stock options granted     $ 16.53  
Maximum [Member] | Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price for stock options granted     $ 17.10