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Redeemable Noncontrolling Interests in Operating Partnership (Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Allocated compensation expense $ 2,146 $ 2,601 $ 1,822
Performance Long Term Incentive Plan Units | Advisory Services Fee      
Debt Instrument [Line Items]      
Allocated compensation expense 884 1,144 785
Long Term Incentive Plan Units | Advisory Services Fee      
Debt Instrument [Line Items]      
Allocated compensation expense 1,142 1,354 976
Long Term Incentive Plan Units | Corporate General and Administrative      
Debt Instrument [Line Items]      
Allocated compensation expense $ 120 $ 103 $ 61