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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) - USD ($)
$ in Thousands
May 12, 2016
Mar. 31, 2017
Dec. 31, 2016
Noncontrolling Interest [Line Items]      
Noncontrolling Interest in Limited Partnerships   $ 1,529,653 $ 1,530,647
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   $ 11,800