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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income (loss) $ 8,315 $ 8,746 $ 24,737 $ 24,491
Less: Net income allocated to participating securities 83 78 237 195
Net income available to common shareholders $ 8,232 $ 8,668 $ 24,500 $ 24,296
Denominator:        
Weighted average common shares outstanding 20,860,000 20,410,000 20,769,000 20,349,000
Weighted average dilutive securities (in shares) 592,000 776,000 629,000 785,000
Weighted average common shares outstanding, diluted 21,452,000 21,186,000 21,398,000 21,134,000
Earnings per share        
Income per common share, basic (in dollars per share) $ 0.39 $ 0.42 $ 1.18 $ 1.19
Income per common share, diluted (in dollars per share) $ 0.38 $ 0.41 $ 1.14 $ 1.15
Employee stock options
        
Earnings Per Share        
Common equivalents excluded from the diluted earnings per share calculation 221,000 229,000 221,000 229,000
Nonvested performance shares
        
Earnings Per Share        
Common equivalents excluded from the diluted earnings per share calculation   12,000   12,000