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Equity-based Compensation - Valuation Assumptions (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Expected term (in years) 6 years 6 months
Volatility 27.39%
Dividend yield 7.21%
Risk-free rate 2.75%
Grant date fair value (in dollars per share) $ 0.76