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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:        
Net income $ 6,175 $ 8,404 $ 21,421 $ 22,417
Less: Net income allocated to participating securities (25) (58) (103) (176)
Net income available to common shareholders $ 6,150 $ 8,346 $ 21,318 $ 22,241
Denominator:        
Weighted average common shares outstanding 20,788 20,988 20,662 21,040
Weighted average dilutive securities 426 533 451 496
Weighted average common shares outstanding, diluted 21,214 21,521 21,113 21,536
Income per common share, basic (in dollars per share) $ 0.30 $ 0.40 $ 1.03 $ 1.06
Income per common share, diluted (in dollars per share) $ 0.29 $ 0.39 $ 1.01 $ 1.03