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Equity-Based Compensation - Information Related to RSAs (Details) - 2017 Incentive Award Plan - Restricted Stock Awards (RSAs) [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested (In shares) $ 13.08 $ 0.00
Granted (in shares) 61  
Granted (in dollars per share) $ 13.08