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Stock-Based Compensation - Restricted Stock Activity Rollforward (Details) (Restricted Stock, USD $)
12 Months Ended
Dec. 31, 2012
Restricted Stock
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Restricted stock, beginning of year, number of shares 190,770
Granted, number of shares 122,912
Vested, number of shares (67,720)
Forfeited, number of shares (8,276)
Canceled, number of shares (6,956)
Restricted stock, end of year, number of shares 230,730
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Restricted stock, beginning of year, weighted-average measurement date fair value $ 14.57
Granted, weighted average grant date fair value $ 14.37
Vested, weighted average grant date fair value $ 14.82
Forfeited, weighted average grant date fair value $ 14.69
Cancelled, weighted average grant date fair value $ 15.00
Restricted stock, end of year, weighted-average measurement date fair value $ 14.38