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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2019
May 12, 2016
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Noncontrolling Interest [Line Items]          
Noncontrolling Interest in Limited Partnerships     $ 1,710,608   $ 1,711,445
Payments to Noncontrolling Interests     24,128 $ 30,690  
Salesforce Tower [Member] | Consolidated Properties [Member]          
Noncontrolling Interest [Line Items]          
Portion of project costs covered by a construction loan   50.00%      
Portion of costs funded (in percentage)   50.00%      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   5.00%      
Debt Instrument, Basis Spread on Variable Rate   3.00%      
Salesforce Tower [Member] | Parent Company [Member] | Consolidated Properties [Member]          
Noncontrolling Interest [Line Items]          
Costs funded (in percentage)   2.50%      
Preferred equity funded     $ 22,600    
Salesforce Tower [Member]          
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