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Fair Value - Classification Between the Three Levels of the Fair Value Hierarchy (Details) - Recurring basis - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
Equity Securities $ 28,926 $ 27,027
Notes Receivable, net 59,071 28,860
Total Assets 96,747 56,342
DownREIT units   1,211
Total Liabilities 7,237,751 7,423,876
Unsecured notes | Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness 6,474,043 6,653,681
Secured Debt, Commercial Paper Program and Variable Rate Unsecured Indebtedness | Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness 763,708 768,984
Interest Rate Caps | Non-designated Hedges | Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 264 455
Interest Rate Swaps | Cash Flow Hedges | Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 8,486  
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
Total Assets 0 0
DownREIT units   1,211
Total Liabilities 6,474,043 6,654,892
Quoted Prices in Active Markets for Identical Assets (Level 1) | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness 6,474,043 6,653,681
Significant Other Observable Inputs (Level 2)    
Financial Instruments Measured/Discussed at Fair Value    
Equity Securities 28,926 27,027
Notes Receivable, net 59,071 28,860
Total Assets 96,747 56,342
Total Liabilities 763,708 768,984
Significant Other Observable Inputs (Level 2) | Secured Debt, Commercial Paper Program and Variable Rate Unsecured Indebtedness    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness 763,708 768,984
Significant Other Observable Inputs (Level 2) | Interest Rate Caps | Non-designated Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 264 455
Significant Other Observable Inputs (Level 2) | Interest Rate Swaps | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 8,486  
Significant Unobservable Inputs (Level 3)    
Financial Instruments Measured/Discussed at Fair Value    
Total Assets 0 0
Total Liabilities $ 0 $ 0