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Redeemable Noncontrolling Interests in Operating Partnership (Allocated Redeemable Noncontrolling Interests) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Noncontrolling Interest [Abstract]    
Net (income) loss attributable to redeemable noncontrolling interests in operating partnership $ 1,079 $ 1,885