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Commitments and Contingencies - Narrative (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
community
multiplier
Lease
property
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Line Items]      
Proceeds from legal recoveries $ 0 $ 0 $ (6,292,000)
Payments to acquire other real estate 771,692,000 0 420,517,000
Right of use lease assets 118,370,000 133,581,000  
Total lease liabilities 146,377,000 161,313,000  
Operating lease, expense 15,458,000 16,011,000 14,371,000
Finance lease, right-of-use asset $ 28,229,000 21,685,000  
Lease Obligations [Abstract]      
Number of real estate properties | community 278    
Number of office leases | Lease 13    
Total lease liabilities $ 20,120,000 $ 20,166,000  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Right of use lease assets Right of use lease assets  
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Lease liabilities Lease liabilities  
Properties on Land Subject to Land Leases      
Lease Obligations [Abstract]      
Number of real estate properties | community 7    
Number of commercial properties owned | property 2    
Assets Held under Operating Leases      
Lease Obligations [Abstract]      
Number of real estate properties | community 6    
Assets Held under Finance Leases      
Commitments and Contingencies Disclosure [Line Items]      
Number of finance leases for parking garages adjacent to communities | Lease 4    
Lease Obligations [Abstract]      
Number of real estate properties | community 1    
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      
Commitments and Contingencies Disclosure [Line Items]      
Proceeds from legal recoveries     (3,126,000)
Avalon Towers      
Commitments and Contingencies Disclosure [Line Items]      
Proceeds from legal recoveries     $ (2,237,000)
Avalon Hackensack at Riverside      
Commitments and Contingencies Disclosure [Line Items]      
Payments to acquire other real estate $ 10,336,000