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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Net income $ 6,139 $ 2,884 $ 1,594 $ 619
Basic-weighted average shares outstanding (in shares) 27,891 27,776 27,894 27,753
Effect of dilutive potential securities (in shares) 248 165 192 173
Diluted- weighted average shares outstanding (in shares) 28,139 27,941 28,086 27,926
Basic (in dollars per share) $ 0.22 $ 0.10 $ 0.06 $ 0.02
Diluted (in dollars per share) $ 0.22 $ 0.10 $ 0.06 $ 0.02
Antidilutive securities excluded from computation of earnings per share (in shares) 1,400 1,700 2,000 1,300