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Equity-based Compensation - Restricted Shares Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
General and Administrative Expense [Member] | Equity Plan [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 0.1 $ 0.6