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Commitments and Contingencies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
multiplier
community
property
Lease
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Line Items]      
Finance Lease, Right-of-Use Asset $ 21,685 $ 21,898  
Employment Agreements and Arrangements [Abstract]      
Proceeds from legal recoveries   (6,292) $ (946)
Lease Obligations [Abstract]      
Number of office leases | Lease 14    
Finance Lease, Liability $ 20,166 20,207  
Right of use lease assets 133,581 103,063  
Operating Lease, Liability 161,313 120,261  
Operating Lease, Expense $ 16,011 $ 14,371 21,788
Properties on Land Subject to Land Leases      
Lease Obligations [Abstract]      
Number of apartment communities | community 10    
Number of commercial properties owned | property 2    
Assets Held under Operating Leases [Member]      
Lease Obligations [Abstract]      
Number of apartment communities | community 9    
Assets Held under Finance Leases [Member]      
Lease Obligations [Abstract]      
Number of apartment communities | community 1    
Number Of Finance Leases For Parking Garages Adjacent To Communities | Lease 2    
Restricted stock and stock options      
Employment Agreements and Arrangements [Abstract]      
Retirement age (in years) 50 years    
Period of the non-compete agreement (in years) 1 year    
Restricted stock and stock options | Minimum      
Employment Agreements and Arrangements [Abstract]      
Service period (in years) 10 years    
Employee's age at retirement plus years of employment (in years) 70 years    
Share Based Compensation Arrangement by Share Based Payment Award Requisite Period of Written Notice for Retirement 6 months    
Restricted stock and stock options | Maximum      
Employment Agreements and Arrangements [Abstract]      
Options exercise period upon termination without cause or retirement (in months) 12 months    
Officer Severance Program | Vice President and Senior Vice President      
Employment Agreements and Arrangements [Abstract]      
Compensation multiplier | multiplier 1    
Officer Severance Program | Executive Vice Presidents      
Employment Agreements and Arrangements [Abstract]      
Compensation multiplier | multiplier 2    
Officer Severance Program | Chief Executive Officer      
Employment Agreements and Arrangements [Abstract]      
Compensation multiplier | multiplier 3    
Officer Severance Program | Maximum      
Employment Agreements and Arrangements [Abstract]      
Termination period following a sale event (in years) 24 months    
Former Development Right [Member]      
Employment Agreements and Arrangements [Abstract]      
Proceeds from legal recoveries $ (3,126)    
Avalon Towers [Member]      
Employment Agreements and Arrangements [Abstract]      
Proceeds from legal recoveries $ (2,237)    
Memorial Heights Villages      
Employment Agreements and Arrangements [Abstract]      
Proceeds from legal recoveries     $ (554)