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Redeemable Noncontrolling Interests Redeemable Noncontrolling Interest (Phantom) (Details)
Sep. 30, 2020
Dec. 31, 2019
General Partnership    
Redeemable Noncontrolling Interests [Line Items]    
Noncontrolling interest, ownership percentage by parent 99.99% 99.99%
Limited Partnership    
Redeemable Noncontrolling Interests [Line Items]    
Noncontrolling limited partnership interest in operating partnership 0.01% 0.01%