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Earnings Per Share - Summary of Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net income attributable to common stockholders $ 3,709 $ 1,114
Earnings allocated to unvested participating securities (19) (18)
Numerator for income per common share - basic and diluted $ 3,690 $ 1,096
Denominator:    
Denominator for basic income per common share - weighted average shares 233,419,299 240,311,744
Effect of dilutive stock-based compensation plans 39,000 27,000
Denominator for diluted income per common share - weighted average shares 233,458,438 240,338,698
Income per common share - basic and diluted $ 0.02 $ 0.00