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Fair Value Measurements
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements
4. Fair Value Measurements

Cash, Cash Equivalents, and Restricted Cash

Cash, cash equivalents, and restricted cash are reflected in the accompanying consolidated balance sheets at amounts considered by management to reasonably approximate fair value due to their short maturity of 90 days or less.

Marketable Securities

As of December 31, 2023 and 2022, marketable securities of $29.8 million and $48.7 million, respectively, are stated at fair value based on valuations provided by third-party pricing services and are classified within Level 2 of the valuation hierarchy.

Interest Rate Derivatives

The Company's derivative assets include interest rate cap and swap instruments that effectively manage the risk above certain interest rates for a portion of the Company's long-term variable rate debt. The Company has not designated the interest rate cap and swap instruments as hedging instruments and as such, changes in the fair value of the instruments are recognized in earnings in the period of the change. The interest rate derivative positions are valued using models developed by the respective counterparty that use as their basis readily available observable market parameters (such as forward yield curves) and are classified within Level 2 of the valuation hierarchy. The Company considers the credit risk of its counterparties when evaluating the fair value of its derivatives.
The following table summarizes the Company's SOFR interest rate cap instruments as of December 31, 2023.

($ in thousands)
Current notional balance$1,231,920 
Weighted average fixed cap rate4.07 %
Earliest maturity date2024 
Latest maturity date2025 
Weighted average remaining term0.8 years
Estimated asset fair value (included in other assets, net) at December 31, 2023$13,268 
Estimated asset fair value (included in other assets, net) at December 31, 2022$10,599 

The following table summarizes the Company's SOFR interest rate swap instrument as of December 31, 2023.

($ in thousands)
Current notional balance$220,000 
Fixed interest rate3.00 %
Remaining term0.3 years
Estimated asset fair value (included in other assets, net) at December 31, 2023$1,611 
Estimated asset fair value (included in other assets, net) at December 31, 2022$4,834 

Long-Term Debt

The Company estimates the fair value of its debt primarily using a discounted cash flow analysis based upon the Company's current borrowing rate for debt with similar maturities and collateral securing the indebtedness. The Company estimates the fair value of its convertible senior notes based on valuations provided by third-party pricing services. The Company had outstanding long-term debt with a carrying amount of approximately $3.7 billion and $3.9 billion as of December 31, 2023 and 2022, respectively. Fair value of the long-term debt is approximately $3.4 billion as of both December 31, 2023 and 2022. The Company's fair value of long-term debt disclosure is classified within Level 2 of the valuation hierarchy.

Asset Impairment Expense

The following is a summary of asset impairment expense.

For the Years Ended December 31,
(in millions)202320222021
Operating lease right-of-use assets$8.3 $13.7 $16.6 
Property, plant and equipment and leasehold intangibles, net6.3 15.9 6.4 
Investment in unconsolidated ventures26.0 — — 
Asset impairment$40.6 $29.6 $23.0 

Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset group may not be recoverable. In estimating the recoverability of asset groups for purposes of the Company’s long-lived asset impairment testing, the Company utilizes future cash flow projections that are developed internally. Any estimates of future cash flow projections necessarily involve predicting unknown future circumstances and events and require significant management judgments and estimates. In arriving at the cash flow projections, the Company considers its historic operating results, approved budgets and business plans, future demographic factors, expected revenue and expense growth rates, estimated asset holding periods, estimated capitalization rates, and other factors. Future events may indicate differences from management's current judgments and estimates which could, in turn, result in future impairments.
Operating Lease Right-of-Use Assets

During the years ended December 31, 2023, 2022, and 2021, the Company evaluated operating lease right-of-use assets for impairment and identified communities with a carrying amount of the assets in excess of the estimated future undiscounted net cash flows expected to be generated by the assets. The Company compared the estimated fair value of the assets to their carrying amount for these identified communities and recorded an impairment charge for the excess of carrying amount over fair value. During the year ended December 31, 2023, the Company recognized the right-of-use assets for the operating leases for 12 communities on the consolidated balance sheet at the estimated fair value of $16.4 million. During the year ended December 31, 2022, the Company recognized the right-of-use assets for the operating leases for eight communities on the consolidated balance sheet at the estimated fair value of $30.9 million. During the year ended December 31, 2021, the Company recognized the right-of-use assets for the operating leases for 11 communities on the consolidated balance sheet at the estimated fair value of $31.0 million. In the aggregate, the Company recorded a non-cash impairment charge of $8.3 million, $13.7 million, and $16.6 million for the years ended December 31, 2023, 2022, and 2021, respectively, to operating lease right-of-use assets. These impairment charges are primarily due to decreased occupancy and future cash flow estimates at certain leased communities, including as a result of the impacts of the COVID-19 pandemic, and reflect the amount by which the carrying amounts of the assets exceeded their estimated fair value.

The fair values of the operating lease right-of-use assets were estimated utilizing a discounted cash flow approach based upon projected community cash flows and market data, including management fees and a market supported lease coverage ratio, all of which are considered Level 3 inputs within the valuation hierarchy. The estimated future cash flows were discounted at a rate that is consistent with a weighted average cost of capital from a market participant perspective.

Property, Plant and Equipment and Leasehold Intangibles, Net

During the years ended December 31, 2023, 2022, and 2021, the Company evaluated property, plant and equipment and leasehold intangibles for impairment and identified properties with a carrying amount of the assets in excess of the estimated future undiscounted net cash flows expected to be generated by the assets. The Company compared the estimated fair value of the assets to their carrying amount for these identified properties and recorded an impairment charge for the excess of carrying amount over fair value.

The Company recorded property, plant and equipment and leasehold intangibles non-cash impairment charges in its operating results of $6.3 million, $15.9 million, and $6.4 million for the years ended December 31, 2023, 2022, and 2021, respectively. These impairment charges are primarily due to property damage sustained at certain communities, decreased occupancy and future cash flow estimates at certain communities, including as a result of the impacts of the COVID-19 pandemic, and/or the completed or potential disposition of underperforming communities and reflect the amount by which the carrying amounts of the assets exceeded their estimated fair value.

Investment in Unconsolidated Ventures

As of July 1, 2021, the Company recognized a $100.0 million asset within investment in unconsolidated ventures on its consolidated balance sheet for the estimated fair value of its retained 20% noncontrolling interest in the HCS Venture. The initial recognized amount of the Company’s 20% equity interest in the HCS Venture was determined based upon a pro-rata share of the total enterprise value of the HCS Venture considering the $400.0 million purchase price paid by HCA Healthcare, as the Company's 20% interest shared ratably in all of the benefits and losses expected to be generated by the HCS Venture. The fair value measurement is classified within Level 2 of the valuation hierarchy.

The Company evaluates realization of its investment in unconsolidated ventures accounted for using the equity method if circumstances indicate the Company's investment is other than temporarily impaired. During the three months ended December 31, 2023, the Company recognized a non-cash impairment charge of $26.0 million on its investment in the HCS Venture as a result of the Company's decision to sell its equity interest prior to the recovery of its market value. The Company determined the $27.4 million fair value of its investment based primarily on the sale agreements with the purchasers. The fair value measurement is classified within Level 2 of the valuation hierarchy.