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Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net (loss) income attributable to common stockholders $ 177 $ 2,104 $ 7,826 $ 14,733
Adjustments to net (loss) income attributable to common stockholders for common share equivalents (316) (186) (526) (556)
Adjusted net (loss) income attributable to common stockholders $ (139) $ 1,918 $ 7,300 $ 14,177
Basic and diluted net income per share attributable to common stockholders (usd per share) $ 0.00 $ 0.03 $ 0.11 $ 0.21
Weighted average shares outstanding:        
Basic (shares) 69,441,639 67,286,615 68,014,855 66,739,723
Diluted (shares) 69,441,639 67,286,615 68,417,253 66,739,723