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Summary of Critical and Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
community
investment
partnership
shares
Dec. 31, 2018
USD ($)
community
investment
partnership
shares
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2016
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 $ 1,200 $ 100      
Number of communities held-for-sale | community 0 0      
Asset impairment charges $ 7,105 $ 0 $ 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 $ 70,087 134,465 44,620    
Cash and cash equivalents - restricted 11,007 16,930 16,506    
Total unrestricted and restricted cash and cash equivalents shown in the consolidated statements of cash flows 81,094 151,395 61,126   $ 170,302
Capitalization          
Capitalized internal costs related to development and redevelopment projects 17,900 18,600 18,800    
Fair Value of Financial Instruments          
Fixed rate debt carrying amount 5,200,000 5,000,000      
Fixed rate debt fair value 5,400,000 5,000,000      
Variable rate debt carrying amount 660,400 619,600      
Variable rate debt fair value 655,800 615,200      
Mortgage-backed-securities available-for-sale fair value $ 72,700 $ 129,500      
Investments, Owned, Federal Income Tax Note [Line Items]          
Tax cuts and jobs act of 2017, change in tax rate     1,500    
Status of cash dividends distributed          
Number of DownREIT limited partnerships | partnership 17 16      
Number of communities in DownREIT Partnerships | community 9 8      
Number of consolidated co-investments that now meet the definition of a VIE | investment 6 8      
Assets related to VIE, net intercompany eliminations $ 1,000,000 $ 849,800      
Liabilities related to VIE, net intercompany eliminations 364,300 261,700      
Noncontrolling interests in VIE $ 122,500 $ 64,500      
Total DownREIT units outstanding (in shares) | shares 1,033,907 912,269      
Redemption value of the variable interest entities $ 311,100 $ 223,700      
Redeemable noncontrolling interest 37,410 35,475 $ 39,206   $ 44,684
Redeemable noncontrolling interest, units of limited partners' interests in DownREIT VIEs 13,000 14,500      
Noncontrolling interest in limited partnerships 97,700 $ 32,400      
CPPIB          
Depreciable life of various categories of fixed assets [Abstract]          
Asset impairment charges $ 7,105        
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        
Accounting Standards Update 2017-12          
Property, Plant and Equipment [Line Items]          
Accumulated other comprehensive loss       $ 200  
Common Stock          
Status of cash dividends distributed          
Ordinary income 83.81% 79.72% 84.04%    
Capital gain 13.78% 15.35% 13.20%    
Unrecaptured section 1250 capital gain 2.41% 4.93% 2.76%    
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 $ 72,651 $ 127,187