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v3.22.4

Commitments and Contingencies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) Lease community multiplier property | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Employment Agreements and Arrangements [Abstract] |  |  |
Proceeds from legal recoveries |  | $ 0 | $ 0
Lease Obligations [Abstract] |  |  |
Number of real estate properties | community | 294 |  |
Number of office leases | Lease | 13 |  |
Right of use lease assets | $ 114,977,000 | 118,370,000 |
Total lease liabilities | 142,602,000 | 146,377,000 |
Operating lease, expense | 15,667,000 | 15,458,000 | $ 16,011,000
Finance lease, right-of-use asset | 28,354,000 | 28,229,000 |
Total lease liabilities | $ 20,069,000 | $ 20,120,000 |
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 |  |  |
Lease Obligations [Abstract] |  |  |
Number of real estate properties | community | 1 |  |
Number of finance leases for parking garages adjacent to communities | Lease | 4 |  |
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 |  |
Required written notice of intent to retire | 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 |  |
Avalon at Assembly Row |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Proceeds from legal recoveries | $ 6,000,000 |  |

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