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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, 2017
Mar. 31, 2016
Equity [Abstract]    
Net income $ 628 $ 2,563
Weighted average number of common shares outstanding 29,872 29,449
Dilutive effect of restricted stock grants after application of the treasury stock method 322 60
Dilutive shares outstanding 30,194 29,509
Basic and diluted earnings per share attributable to common stockholders (in dollars per share) $ 0.02 $ 0.09