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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Noncontrolling Interest [Line Items]        
Noncontrolling Interest in Limited Partnerships   $ 1,726,933 $ 1,728,689  
Payments to Noncontrolling Interests   $ 58,811 69,913 $ 82,501
Acquisition of noncontrolling interest in property partnership     $ (186,963)  
Salesforce Tower        
Noncontrolling Interest [Line Items]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 5.00%      
Payments to Noncontrolling Interests $ 210,900      
Repayment of Preferred Equity 24,100      
Net Payments To Minority Shareholder 186,800      
Acquisition of noncontrolling interest in property partnership $ 162,500