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Share-Based Compensation - Textual (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 25,000 $ 50,000
Options exercised during period 720  
Options exercised, total intrinsic value 2,000  
Cash received from exercise of stock options 4,000 235,000
Tax benefit realized from exercise of stock options 0 20,000
Unrecognized compensation cost related to non-vested share-based compensation arrangements 347,000  
Weighted average period to recognize unrecognized share-based compensation cost 3 years 9 months 11 days  
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Tax benefit of stock option compensation expense $ 4,000 $ 9,000