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Earnings Per Share - Antidilutive securities excluded from the computation of net income per share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-Dilutive Weighted Average Shares Outstanding (in shares) 22,567,167 26,654,213 23,632,362 26,991,801
Holdings limited partnership units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-Dilutive Weighted Average Shares Outstanding (in shares) 17,177,313 21,594,086 18,308,766 21,958,470
Unvested restricted share-based awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-Dilutive Weighted Average Shares Outstanding (in shares) 5,389,854 5,060,127 5,323,596 5,033,331