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Stockholders' Equity - Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Equity [Abstract]    
Net income attributable to common stockholders — basic and diluted $ 2,563 $ 3,592
Weighted average number of common shares outstanding 29,449 29,149
Dilutive effect of outstanding stock options and restricted stock grants after application of the treasury stock method 60 57
Dilutive shares outstanding 29,509 29,206
Basic and diluted earnings per share attributable to common stockholders (in dollars per share) $ 0.09 $ 0.12