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Fair value of financial instruments | 6 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Fair value of financial instruments | Fair values of financial instruments The Company measures the fair value of certain assets, liabilities and noncontrolling interests subject to put provisions (redeemable equity interests classified as temporary equity) based upon certain valuation techniques that include observable or unobservable inputs and assumptions that market participants would use in pricing these assets, liabilities, temporary equity and commitments. The Company has also classified assets, liabilities and temporary equities that are measured at fair value on a recurring basis into the appropriate fair value hierarchy levels as defined by the Financial Accounting Standards Board (FASB). The following table summarizes the Company’s assets, liabilities and temporary equities measured at fair value on a recurring basis as of June 30, 2025:
| Total |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
Assets |  |  |  |  |  |  |
Investments in equity securities | $ | 37,953 |  |  | $ | 37,953 |  |  |  |  |  |  |
Interest rate cap agreements | $ | 17,187 |  |  |  |  |  | $ | 17,187 |  |  |  |
Liabilities |  |  |  |  |  |  |
Contingent earn-out obligations for acquisitions | $ | 9,393 |  |  |  |  |  |  |  |  | $ | 9,393 |
Temporary equity |  |  |  |  |  |  |
Noncontrolling interests subject to put provisions | $ | 1,660,990 |  |  |  |  |  |  |  |  | $ | 1,660,990 |
Investments in equity securities represent investments in various open-ended registered investment companies (mutual funds) and common stocks and are recorded at fair value estimated based on reported market prices or redemption prices, as applicable. See Note 4 for further discussion. Interest rate cap agreements are recorded at fair value estimated from valuation models utilizing the income approach and commonly accepted valuation techniques that use inputs from closing prices for similar assets and liabilities in active markets as well as other relevant observable market inputs at quoted intervals such as current interest rates, forward yield curves, implied volatility and credit default swap pricing. The Company does not believe the ultimate amount that could be realized upon settlement of these interest rate cap agreements would be materially different from the fair value estimates currently reported. See Note 6 for further discussion. As of June 30, 2025, the Company had contingent earn-out obligations associated with business acquisitions that could result in the Company paying the former owners a total of up to approximately $23,420 if certain performance targets or quality margins are met over the next one year to five years. The estimated fair value measurements of these contingent earn-out obligations are primarily based on unobservable inputs, including key financial metrics such as projected earnings before interest, taxes, depreciation, and amortization (EBITDA), revenue and other key performance indicators. The estimated fair values of these contingent earn-out obligations are remeasured as of each reporting date and could fluctuate based upon any significant changes in key assumptions, such as changes in the Company's credit risk adjusted rate that is used to discount obligations to present value. The estimated fair value of noncontrolling interests subject to put provisions is based principally on the higher of either estimated liquidation value of net assets or a multiple of earnings for each subject dialysis partnership, based on historical earnings, revenue mix, and other performance indicators that can affect future results. The multiples used for these valuations are derived from observed ownership transactions for dialysis businesses between unrelated parties in the U.S. in recent years, and the specific valuation multiple applied to each dialysis partnership is principally determined by its recent and expected revenue mix and contribution margin. As of June 30, 2025, an increase or decrease in the weighted average multiple used in these valuations of one times EBITDA would change the estimated fair value of these noncontrolling interests by approximately $220,000. See Notes 16 and 23 to the Company's consolidated financial statements included in the 2024 10-K for further discussion of the Company’s methodology for estimating the fair value of noncontrolling interests subject to put obligations. For a reconciliation of changes in noncontrolling interests subject to put provisions for the six months ended June 30, 2025, see the consolidated statements of equity. The Company's fair value estimates for its senior secured credit facilities are based upon quoted bid and ask prices for these instruments, a level 2 input. For the Company's senior notes, fair value estimates are based on market level 1 inputs. See Note 6 for further discussion of the Company's debt. The fair value of the Company's contingent consideration payable to Medtronic, Inc. for its interest in Mozarc Medical Holding LLC approximates $12,500, which is based on level 3 inputs. Other financial instruments consist primarily of cash and cash equivalents, restricted cash and cash equivalents, accounts receivable, investments in debt securities, accounts payable, other accrued liabilities, lease liabilities and debt. The balances of financial instruments other than debt and lease liabilities are presented in these condensed consolidated financial statements at June 30, 2025 at their approximate fair values due to the short-term nature of their settlements.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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