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Summary of Critical and Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
community
investment
partnership
shares
Dec. 31, 2017
USD ($)
community
shares
Dec. 31, 2016
USD ($)
property
Jan. 01, 2019
USD ($)
Dec. 31, 2015
USD ($)
Property, Plant and Equipment [Line Items]          
Buildings and improvements $ 10,664,745 $ 10,643,009      
Prepaid expenses and other assets $ 39,439 $ 39,155      
Noncontrolling interest in Operating Partnership 3.40% 3.40%      
Real Estate Rental Properties [Abstract]          
Threshold useful life of assets for capitalization 1 year        
Depreciable life of various categories of fixed assets [Abstract]          
Acquired in-place lease value, net $ 100 $ 400      
Number of communities held-for-sale | community 0 0      
Revenues and Gains on Sale of Real Estate [Abstract]          
Lease terms, minimum 6 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 $ 134,465 $ 44,620 $ 64,921    
Cash and cash equivalents - restricted 16,930 16,506 105,381    
Total unrestricted and restricted cash and cash equivalents shown in the consolidated statements of cash flows 151,395 61,126 170,302   $ 123,055
Capitalization          
Capitalized internal costs related to development and redevelopment projects 18,600 18,800 $ 16,400    
Fair Value of Financial Instruments          
Fixed rate debt, carrying amount 5,000,000 4,900,000      
Fixed rate debt, fair value 5,000,000 5,000,000      
Variable rate debt, carrying amount 619,600 799,200      
Variable rate debt, fair value 615,200 793,900      
Mortgage-backed-securities, available-for-sale, fair value 129,500 120,700      
Investments, Owned, Federal Income Tax Note [Line Items]          
Number of properties disposed | property     2    
Deferred tax expense on gain on sale of real estate and land $ 0 0 $ 4,410    
Tax cuts and jobs act of 2017, change in tax rate   1,500      
Status of cash dividends distributed          
Number of DownREIT limited partnerships | partnership 16        
Number of communities in DownREIT Partnerships | community 8        
Number of consolidated co-investments that now meet the definition of a VIE | investment 8        
Assets related to VIE, net intercompany eliminations $ 849,800 837,700      
Liabilities related to VIE, net intercompany eliminations 261,700 265,500      
NCI in VIE $ 64,500 $ 66,700      
Total DownREIT units outstanding (in shares) | shares 912,269 917,593      
Redemption value of the variable interest entities $ 223,700 $ 221,500      
Redeemable noncontrolling interest 35,475 39,206 $ 44,684   $ 45,452
Redeemable noncontrolling interest, units of limited partners' interests in DownREIT VIEs 14,500 13,600      
Noncontrolling interest in limited partnerships $ 32,400 32,400      
Computer software and equipment [Member] | Minimum [Member]          
Depreciable life of various categories of fixed assets [Abstract]          
Depreciable life, average 3 years        
Computer software and equipment [Member] | Maximum [Member]          
Depreciable life of various categories of fixed assets [Abstract]          
Depreciable life, average 5 years        
Interior apartment home improvements [Member]          
Depreciable life of various categories of fixed assets [Abstract]          
Depreciable life, average 5 years        
Furniture, fixtures and equipment [Member] | Minimum [Member]          
Depreciable life of various categories of fixed assets [Abstract]          
Depreciable life, average 5 years        
Furniture, fixtures and equipment [Member] | Maximum [Member]          
Depreciable life of various categories of fixed assets [Abstract]          
Depreciable life, average 10 years        
Land improvements and certain exterior components of real property [Member]          
Depreciable life of various categories of fixed assets [Abstract]          
Depreciable life, average 10 years        
Real estate structures [Member]          
Depreciable life of various categories of fixed assets [Abstract]          
Depreciable life, average 30 years        
ASU 2017-05 [Member]          
Property, Plant and Equipment [Line Items]          
Cumulative adjustment to retained earnings   123,708      
ASU 2014-09 [Member] | Maximum [Member] | Forecast          
Property, Plant and Equipment [Line Items]          
Right-of-use asset       $ 85,000  
Operating lease, liability       $ 85,000  
Reclassification [Member]          
Property, Plant and Equipment [Line Items]          
Buildings and improvements   13,200      
Prepaid expenses and other assets   $ (13,200)      
Common Stock [Member]          
Status of cash dividends distributed          
Ordinary income 79.72% 84.04% 86.68%    
Capital gain 15.35% 13.20% 7.11%    
Unrecaptured section 1250 capital gain 4.93% 2.76% 6.21%    
Total cash dividends distributed, percentage 100.00% 100.00% 100.00%    
Series H Preferred Stock [Member]          
Status of cash dividends distributed          
Ordinary income 0.00% 0.00% 86.68%    
Capital gain 0.00% 0.00% 7.11%    
Unrecaptured section 1250 capital gain 0.00% 0.00% 6.21%    
Total cash dividends distributed, percentage 0.00% 0.00% 100.00%