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Summary of Critical and Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
investment
property
community
partnership
shares
Dec. 31, 2020
USD ($)
community
investment
property
apartment
partnership
shares
Dec. 31, 2019
USD ($)
apartment
Dec. 31, 2018
USD ($)
Property, Plant and Equipment [Line Items]        
Noncontrolling interest in operating partnership 3.40% 3.40%    
Real Estate Rental Properties [Abstract]        
Minimum threshold useful life of assets for capitalization 1 year      
Depreciable life of various categories of fixed assets [Abstract]        
Acquired in-place lease value, net $ 8,900,000 $ 4,700,000    
Number of properties held-for-sale | property 0 2    
Asset impairment charges $ 0 $ 1,825,000 $ 7,105,000  
Other-than-temporary impairment $ 0 $ 0    
Number of apartment units | apartment   439    
Revenues and Gains on Sale of Real Estate [Abstract]        
Lease terms, minimum 9 months      
Lease terms, maximum 12 months      
Cash Equivalents and Restricted Cash [Abstract]        
Original maturities of highly liquid investments to be classified as cash equivalents, maximum 3 months      
Cash and cash equivalents - unrestricted $ 48,420,000 $ 73,629,000 70,087,000  
Cash and cash equivalents - restricted 10,218,000 10,412,000 11,007,000  
Total unrestricted and restricted cash and cash equivalents shown in the consolidated statements of cash flows 58,638,000 84,041,000 81,094,000 $ 151,395,000
Marketable Securities        
Equity Securities, FV-NI 800,000 2,500,000    
Capitalization        
Capitalized internal costs related to development and redevelopment projects 23,600,000 31,400,000 42,100,000  
Fair Value of Financial Instruments        
Fixed rate debt carrying amount 5,700,000,000 5,500,000,000    
Fixed rate debt fair value 6,000,000,000 6,000,000,000    
Variable rate debt carrying amount 564,900,000 775,100,000    
Variable rate debt fair value $ 561,700,000 $ 770,100,000    
Status of cash dividends distributed        
Number of DownREIT limited partnerships | partnership 18 17    
Number of communities in DownREIT Partnerships | community 9 9    
Number of consolidated co-investments that now meet the definition of a VIE | investment 6 5    
Assets related to VIE, net intercompany eliminations $ 909,300,000 $ 898,500,000    
Liabilities related to VIE, net intercompany eliminations 320,100,000 326,800,000    
Noncontrolling interests in VIE $ 122,400,000 $ 120,800,000    
Total DownREIT units outstanding (in shares) | shares 978,854 1,017,460    
Redemption value of the variable interest entities $ 344,800,000 $ 241,600,000    
Redeemable noncontrolling interest 34,666,000 32,239,000 37,410,000 $ 35,475,000
Redeemable noncontrolling interest, units of limited partners' interests in DownREIT VIEs 7,700,000 11,900,000    
Noncontrolling interest in limited partnerships $ 97,400,000 $ 97,400,000    
CPPIB        
Depreciable life of various categories of fixed assets [Abstract]        
Asset impairment charges     7,100,000  
Other-than-temporary impairment     $ 11,500,000  
Equity method investment, ownership percentage     45.00%  
Number of apartment units | apartment     49  
Computer software and equipment | Minimum        
Depreciable life of various categories of fixed assets [Abstract]        
Depreciable life, average 3 years      
Computer software and equipment | Maximum        
Depreciable life of various categories of fixed assets [Abstract]        
Depreciable life, average 5 years      
Interior apartment home improvements        
Depreciable life of various categories of fixed assets [Abstract]        
Depreciable life, average 5 years      
Furniture, fixtures and equipment | Minimum        
Depreciable life of various categories of fixed assets [Abstract]        
Depreciable life, average 5 years      
Furniture, fixtures and equipment | Maximum        
Depreciable life of various categories of fixed assets [Abstract]        
Depreciable life, average 10 years      
Land improvements and certain exterior components of real property        
Depreciable life of various categories of fixed assets [Abstract]        
Depreciable life, average 10 years      
Real estate structures        
Depreciable life of various categories of fixed assets [Abstract]        
Depreciable life, average 30 years      
Common stock        
Status of cash dividends distributed        
Ordinary income 70.92% 85.23% 83.81%  
Capital gain 22.07% 10.68% 13.78%  
Unrecaptured section 1250 capital gain 7.01% 4.09% 2.41%  
Total cash dividends distributed, percentage 100.00% 100.00% 100.00%