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Summary of Critical and Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
community
partnership
investment
shares
Dec. 31, 2019
USD ($)
investment
community
partnership
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Property, Plant and Equipment [Line Items]        
Noncontrolling interest in operating partnership 3.40% 3.40%    
Cumulative effect upon adoption $ 6,183,192 $ 6,403,504 $ 6,393,844 $ 6,396,825
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 $ 4,700 $ 1,200    
Number of communities held-for-sale | community 2 0    
Asset impairment charges $ 1,825 $ 7,105 0  
Other-than-temporary impairment   11,500    
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 $ 73,629 70,087 134,465  
Cash and cash equivalents - restricted 10,412 11,007 16,930  
Total unrestricted and restricted cash and cash equivalents shown in the consolidated statements of cash flows 84,041 81,094 151,395 61,126
Capitalization        
Capitalized internal costs related to development and redevelopment projects 31,400 42,100 37,300  
Fair Value of Financial Instruments        
Fixed rate debt carrying amount 5,500,000 5,200,000    
Fixed rate debt fair value 6,000,000 5,400,000    
Variable rate debt carrying amount 775,100 660,400    
Variable rate debt fair value 770,100 655,800    
Mortgage-backed-securities available-for-sale fair value $ 0 $ 72,700    
Status of cash dividends distributed        
Number of DownREIT limited partnerships | partnership 17 17    
Number of communities in DownREIT Partnerships | community 9 9    
Number of consolidated co-investments that now meet the definition of a VIE | investment 5 6    
Assets related to VIE, net intercompany eliminations $ 898,500 $ 1,000,000    
Liabilities related to VIE, net intercompany eliminations 326,800 364,300    
Noncontrolling interests in VIE $ 120,800 $ 122,500    
Total DownREIT units outstanding (in shares) | shares 1,017,460 1,033,907    
Redemption value of the variable interest entities $ 241,600 $ 311,100    
Redeemable noncontrolling interest 32,239 37,410 35,475 39,206
Redeemable noncontrolling interest, units of limited partners' interests in DownREIT VIEs 11,900 13,000    
Noncontrolling interest in limited partnerships 97,400 97,700    
Distributions in excess of accumulated earnings        
Property, Plant and Equipment [Line Items]        
Cumulative effect upon adoption $ (861,193) (887,619) $ (812,796) $ (833,726)
Cumulative Effect, Period of Adoption, Adjusted Balance | Distributions in excess of accumulated earnings        
Property, Plant and Equipment [Line Items]        
Cumulative effect upon adoption   200    
CPPIB        
Depreciable life of various categories of fixed assets [Abstract]        
Asset impairment charges   $ 7,100    
Equity method investment, ownership percentage   45.00%    
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 85.23% 83.81% 79.72%  
Capital gain 10.68% 13.78% 15.35%  
Unrecaptured section 1250 capital gain 4.09% 2.41% 4.93%  
Total cash dividends distributed, percentage 100.00% 100.00% 100.00%  
Mortgage Backed Securities        
Fair Value of Financial Instruments        
Mortgage-backed-securities held-to-maturity carrying value $ 0 $ 72,651