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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net income $ 5,500 $ 8,074 $ 7,487 $ 15,246
Less: Net income allocated to participating securities 0 (32) 0 (96)
Net income available to common shareholders $ 5,500 $ 8,042 $ 7,487 $ 15,150
Denominator:        
Weighted average common shares outstanding 17,354 20,760 18,336 20,662
Weighted average dilutive securities 325 455 302 473
Weighted average common shares outstanding, diluted 17,679 21,215 18,638 21,135
Income per common share, basic (in dollars per share) $ 0.32 $ 0.39 $ 0.41 $ 0.73
Income per common share, diluted (in dollars per share) $ 0.31 $ 0.38 $ 0.40 $ 0.72