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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator:    
Net income $ 1,987 $ 7,172
Less: Net income allocated to participating securities 0 (45)
Net income available to common shareholders $ 1,987 $ 7,127
Denominator:    
Weighted average common shares outstanding 19,321 20,562
Weighted average dilutive securities 313 490
Weighted average common shares outstanding, diluted 19,634 21,052
Income per common share, basic (in dollars per share) $ 0.10 $ 0.35
Income per common share, diluted (in dollars per share) $ 0.10 $ 0.34