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Stock-Based Compensation (Details) (USD $)
3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Stock options
Mar. 31, 2012
Restricted stock awards
Mar. 31, 2011
Restricted stock awards
Mar. 31, 2013
Restricted stock awards
Mar. 31, 2012
Restricted stock awards
Non-employee directors
Mar. 31, 2011
Restricted stock awards
Non-employee directors
Mar. 31, 2012
Restricted stock awards
Executive management
Mar. 31, 2011
Restricted stock awards
Executive management
Stock-Based Compensation                    
Stock-based compensation cost recognized $ 300,000 $ 200,000                
Shares                    
Options outstanding at the beginning of the period (in shares)     714,900              
Options outstanding at the end of the period (in shares)     714,900              
Options exercisable at the end of the period (in shares)     649,900              
Weighted Average Exercise Price                    
Options outstanding at the beginning of the period (in dollars per share)     $ 8.06              
Options outstanding at the end of the period (in dollars per share)     $ 8.06              
Options exercisable at the end of the period (in dollars per share)     $ 8.17              
Weighted Average Remaining Contractual Term (Years)                    
Options outstanding at the end of the period     4 years 2 months 8 days              
Options exercisable at the end of the period     3 years 11 months 19 days              
Aggregate Intrinsic Value                    
Options outstanding at the end of the period     1,450,000              
Options exercisable at the end of the period     1,259,000              
Unrecognized compensation                    
Total unrecognized compensation cost     100,000              
Weighted average period for recognition of total unrecognized compensation cost     4 months 24 days     1 year 9 months 18 days        
Restricted Stock Awards                    
Period over which stock awards vest             1 year 1 year 3 years 3 years
Weighted-average grant-date fair value of awards (in dollars per share)       $ 8.78 $ 6.58          
Total unrecognized compensation cost           $ 900,000        
Summary of restricted stock awards and related activity                    
Shares outstanding at the beginning of the period           211,521        
Shares granted             26,250 27,258 139,357 68,868
Shares vested           (95,658)        
Shares outstanding at the end of the period           115,863