COVID-19 Pandemic	12 Months Ended
COVID-19 Pandemic	Dec. 31, 2022
Unusual or Infrequent Items, or Both [Abstract]
COVID-19 Pandemic	3. COVID-19 Pandemic The COVID-19 pandemic has adversely impacted the Company's occupancy and resident fee revenue beginning in March 2020, resulted in incremental direct costs to respond to the pandemic, and for the year ended December, 31, 2021, resulted in net cash used in operating activities. The health and wellbeing of the Company's residents and associates has been and continues to be its highest priority. Government Provided Financial Relief. The Coronavirus Aid, Relief, and Economic Security Act of 2020 ("CARES Act"), signed into law on March 27, 2020, and Paycheck Protection Program and Health Care Enhancement Act, signed into law on April 24, 2020, provided liquidity and financial relief to certain businesses, among other things. Certain impacts of such programs are provided below. •During the years ended December 31, 2022, 2021, and 2020, the Company accepted $61.1 million, $0.8 million, and $109.8 million, respectively, of cash from grants from the Public Health and Social Services Emergency Fund ("Provider Relief Fund") administered by U.S. Department of Health and Human Services, under which grants have been made available to eligible healthcare providers for healthcare related expenses or lost revenues attributable to COVID-19. •During the year ended December 31, 2020, the Company received $87.5 million under the Accelerated and Advance Payment Program administered by the Centers for Medicare & Medicaid Services ("CMS"), $75.2 million of which related to its former Health Care Services segment and $12.3 million of which related to its CCRCs segment. During the years ended December 31, 2022 and 2021, $3.1 million and $20.8 million, respectively, of the advanced payments were recouped per the terms of the program. Pursuant to the sale of 80% of the Company's equity in its Health Care Services segment (as described in Note 4), $63.6 million of such obligations related to its former Health Care Services segment were retained by the unconsolidated HCS Venture. As of December 31, 2022, the Company has no remaining obligations under the program. •During the year ended December 31, 2020, the Company deferred payment of $72.7 million of the employer portion of social security payroll taxes incurred from March 27, 2020 through December 31, 2020 pursuant to the CARES Act. Pursuant to the sale of 80% of the Company's equity in its Health Care Services segment, $9.6 million of such obligations related to its former Health Care Services segment were retained by the unconsolidated HCS Venture. In both December 2021 and 2022, the Company paid $31.6 million of its retained deferred amount. As of December 31, 2022, the Company has no remaining obligations for the deferred payroll tax program. •The Company was eligible to claim the employee retention credit on wages paid from March 12, 2020 to December 31, 2021 for certain of its associates under the CARES Act and subsequent legislation. During the year ended December 31, 2021, the Company recognized $9.9 million of employee retention credits on wages paid from March 12, 2020 to December 31, 2020 within other operating income, for which the Company has received $4.6 million in cash as of December 31, 2022. During the year ended December 31, 2022, the Company recognized $9.4 million of employee retention credits on wages paid in 2021 within other operating income. The Company has a receivable for $14.7 million and $6.5 million included within prepaid expenses and other current assets, net on the consolidated balance sheets as of December 31, 2022 and 2021, respectively. In addition to the grants previously described, during the years ended December 31, 2022, 2021, and 2020, the Company recognized $10.0 million, $1.7 million, and $5.9 million, respectively, of other operating income from grants from other government sources. The Company cannot predict with reasonable certainty the impacts that COVID-19 ultimately will have on its business, results of operations, cash flow, and liquidity, and its response efforts may delay or negatively impact its strategic initiatives, including plans for future growth. The ultimate impacts of COVID-19 will depend on many factors, some of which cannot be foreseen, including the duration, severity, and breadth of the pandemic and any resurgence or variants of the disease; the impact of COVID-19 on the nation's economy and debt and equity markets and the local economies in the Company's markets; the development, availability, utilization, and efficacy of COVID-19 testing, therapeutic agents, and vaccines and the prioritization of such resources among businesses and demographic groups; government financial and regulatory relief efforts that may become available to business and individuals, including the Company's ability to qualify for and satisfy the terms and conditions of financial relief; restrictions on visitors and move-ins at the Company's communities as a result of infections at a community or as necessary to comply with regulatory requirements or at the direction of authorities having jurisdiction; perceptions regarding the safety of senior living communities during and after the pandemic; changes in demand for senior living communities and the Company's ability to adapt its sales and marketing efforts to meet that demand; the impact of COVID-19 on the Company's residents' and their families' ability to afford its resident fees, including due to changes in unemployment rates, consumer confidence, housing markets, and equity markets caused by COVID-19; changes in the acuity levels of the Company's new residents; the disproportionate impact of COVID-19 on seniors generally and those residing in the Company's communities; the duration and costs of the Company's response efforts, including increased equipment, supplies, labor, litigation, testing, vaccination clinic, health plan, and other expenses; greater use of contract labor and other premium labor due to COVID-19 and general labor market conditions; the impact of COVID-19 on the Company's ability to complete financings and refinancings of various assets, or other transactions or to generate sufficient cash flow to cover required debt, interest, and lease payments and to satisfy financial and other covenants in its debt and lease documents; increased regulatory requirements, including the costs of unfunded, mandatory testing of residents and associates and provision of test kits to the Company's health plan participants; increased enforcement actions resulting from COVID-19; government action that may limit the Company's collection or discharge efforts for delinquent accounts; and the frequency and magnitude of legal actions and liability claims that may arise due to COVID-19 or the Company's response efforts.