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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Numerator:    
Net income $ 6,272 $ 6,960
Less: Net income allocated to participating securities (62) (62)
Net income available to common shareholders $ 6,210 $ 6,898
Denominator:    
Weighted average common shares outstanding 21,036,000 20,661,000
Weighted average dilutive securities (in shares) 477,000 650,000
Weighted average common shares outstanding, diluted 21,513,000 21,311,000
Earnings per share    
Income per common share, basic (in dollars per share) $ 0.30 $ 0.33
Income per common share, diluted (in dollars per share) $ 0.29 $ 0.32
Employee stock options
    
Earnings Per Share    
Common equivalents excluded from the diluted earnings per share calculation 110,000 220,000
Restricted Stock
    
Earnings Per Share    
Common equivalents excluded from the diluted earnings per share calculation 64,000  
Nonvested performance shares
    
Earnings Per Share    
Common equivalents excluded from the diluted earnings per share calculation 85,000 17,000