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Fair Value Measurements of Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Oct. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Marketable securities – certificates of deposit | $ 2,125 |  |  |  |  |  |
Equity securities | 896 |  | $ 5,567 |  |  |  |
Investments in other entities – equity method | 44,428 | $ 45,832 | 40,299 |  | $ 38,954 | $ 43,820 | $ 41,715
Apollo-Sun Labs Management, LLC |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Equity interest purchase obligation, noncurrent | 8,100 |  | 5,800 |  |  |  |
Change in fair value of equity interest | 2,300 |  |  |  |  |  |
AAMG contingent consideration |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Interest acquired |  |  |  | 100.00% |  |  |
Cash contingent consideration | 5,200 |  | 5,900 |  |  |  |
Stock contingent consieration | $ 5,600 |  | 5,600 |  |  |  |
DMG And Sun Labs |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Equity interest purchase obligation, period to purchase | 3 years |  |  |  |  |  |
DMG remaining equity interest purchase |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Investments in other entities – equity method | $ 8,500 |  |  |  |  |  |
Interest rate collar |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative asset, fair value | $ 1,300 |  |  |  |  |  |
Derivative, ceiling interest rate | 5.00% |  |  |  |  |  |
Derivative, floor interest rate | 2.34% |  |  |  |  |  |
Contingent equity securities |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Contingent equity securities |  |  | 1,900 |  |  |  |
Other Noncurrent Assets | Interest rate swap | Cash flow hedges: | Derivatives designated as hedging instruments |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative asset, fair value | $ 4,200 |  | 3,200 |  |  |  |
Certificates of Deposit |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Short-term marketable securities, maturity period | 90 days |  |  |  |  |  |
Marketable securities – certificates of deposit | $ 2,100 |  | $ 0 |  |  |  |

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