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Stock-Based Compensation (Details) (USD $)
9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Restricted Stock
Sep. 30, 2012
Restricted Stock
Sep. 30, 2013
Restricted Stock
Sep. 30, 2012
Restricted Stock
Oct. 18, 2013
Restricted Stock
Subsequent event
Sep. 30, 2013
Restricted Stock With Performance Conditions
Number of Shares                
Outstanding at beginning of period (in shares)         243,124      
Granted (in shares)         175,213   248,305 58,909
Forfeited (in shares)         (3,181)      
Vested (in shares)         (143,266)      
Outstanding at end of period (in shares)     271,890   271,890      
Additional disclosures                
Compensation expense, net of forfeitures $ 674,000 $ 446,000 $ 172,000 $ 160,000 $ 674,000 $ 446,000    
Market value (in dollars per share)         $ 7.03   $ 8.23  
Service period over which value of the shares is amortized to compensation expense             5 years 3 years