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Overview - Narrative (Details)
$ in Thousands, ft² in Millions
Jun. 30, 2020
USD ($)
ft²
land_parcel
joint_venture
unit
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
ft²
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Real Estate Properties [Line Items]            
Consolidated debt $ 4,702,892   $ 4,653,264      
Number of joint ventures consolidated | joint_venture 4          
Consolidated assets $ 9,271,377   9,349,301      
Consolidated investment in real estate 8,884,939   8,960,218      
Consolidated liabilities 5,227,038   4,978,367      
Consolidated liabilities related to debt 4,666,603   4,619,058      
Consolidated equity 4,044,339 $ 4,129,707 4,370,934 $ 4,052,360 $ 3,788,182 $ 3,848,430
Consolidated equity related to noncontrolling interest $ 1,563,362   1,658,862      
Wholly owned and Consolidated properties            
Real Estate Properties [Line Items]            
Number of land parcels subject to ground lease | land_parcel 2          
Wholly owned and Consolidated properties | Office            
Real Estate Properties [Line Items]            
Area of real estate portfolio (sq ft) | ft² 17.9          
Wholly owned and Consolidated properties | Multifamily            
Real Estate Properties [Line Items]            
Number of multifamily apartment units | unit 4,209          
Unconsolidated Fund properties | Office            
Real Estate Properties [Line Items]            
Area of real estate portfolio (sq ft) | ft² 0.4     1.8    
Subsidiaries            
Real Estate Properties [Line Items]            
Consolidated debt $ 3,112,892   $ 3,113,264      
Consolidated entities            
Real Estate Properties [Line Items]            
Consolidated assets 9,270,000          
Consolidated investment in real estate 8,880,000          
Consolidated liabilities 5,230,000          
Consolidated liabilities related to debt 4,670,000          
Consolidated equity 4,040,000          
Consolidated equity related to noncontrolling interest $ 1,560,000