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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) - USD ($)
$ in Thousands
May 12, 2016
Jun. 30, 2017
Jun. 06, 2017
Dec. 31, 2016
Noncontrolling Interest [Line Items]        
Noncontrolling Interest in Limited Partnerships   $ 1,653,981   $ 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   $ 13,500    
767 Fifth Avenue (the General Motors Building) | Consolidated Properties [Member]        
Noncontrolling Interest [Line Items]        
Noncontrolling Interest in Limited Partnerships     $ 109,600  
Ownership Percentage by the Company     60.00%  
Unpaid principal balance of the members' notes payable contributed to equity     $ 273,900  
767 Fifth Avenue (the General Motors Building) | Consolidation, Eliminations [Member] | Consolidated Properties [Member]        
Noncontrolling Interest [Line Items]        
Unpaid principal balance of the members' notes payable contributed to equity     $ 164,400