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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator:        
Net income $ 8,404 $ 8,315 $ 22,417 $ 24,737
Less: Net income allocated to participating securities (58) (83) (176) (237)
Net income available to common shareholders $ 8,346 $ 8,232 $ 22,241 $ 24,500
Denominator:        
Weighted average common shares outstanding 20,988 20,860 21,040 20,769
Weighted average dilutive securities 533 592 496 629
Weighted average common shares outstanding, diluted 21,521 21,452 21,536 21,398
Income per common share, basic (in dollars per share) $ 0.40 $ 0.39 $ 1.06 $ 1.18
Income per common share, diluted (in dollars per share) $ 0.39 $ 0.38 $ 1.03 $ 1.14