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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of significant unobservable inputs of level 3 financial assets and liabilities (Details) $ in Thousands | Sep. 30, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares
--- | --- | ---
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value | $ 549,142 | $ 701,652
Total assets measured at fair value | 1,628,239 | 1,841,185
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 4,584 | 4,648
Contingent consideration | 27,987 | 31,046
Total liabilities measured at fair value | 39,691 | 41,764
Significant unobservable inputs (Level 3) |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value | 549,142 | 701,652
Total assets measured at fair value | 1,224,259 | 1,070,117
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 4,584 | 4,648
Contingent consideration | 27,987 | 31,046
Total liabilities measured at fair value | $ 32,571 | $ 35,694
Significant unobservable inputs (Level 3) | Market interest rate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent earnout, measurement input, percent | 0.085 | 0.085
Significant unobservable inputs (Level 3) | Revenue volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent earnout, measurement input, percent | 0.051 |
Significant unobservable inputs (Level 3) | Weighted Average | Market interest rate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent earnout, measurement input, percent | 0.085 | 0.085
Significant unobservable inputs (Level 3) | Weighted Average | Revenue volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent earnout, measurement input, percent | 0.051 |
Significant unobservable inputs (Level 3) | Market approach |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value | $ 604,657 | $ 304,172
Fair value | 25,910 | 7,153
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | $ 4,584 | $ 4,648
Significant unobservable inputs (Level 3) | Market approach | Multiple of EBITDA |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans receivable at fair value, measurement input |  | 4.5
Significant unobservable inputs (Level 3) | Market approach | Multiple of Sales |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input |  | 3.0
Significant unobservable inputs (Level 3) | Market approach | Operating income multiple |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Mandatorily redeemable noncontrolling interesting, measurement input | 6.0 | 6
Significant unobservable inputs (Level 3) | Market approach | Minimum | Multiple of EBITDA |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 1.8 | 1.5
Significant unobservable inputs (Level 3) | Market approach | Minimum | Multiple of Sales |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 0.7 |
Significant unobservable inputs (Level 3) | Market approach | Minimum | Market price of related security |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | $ / shares | 0.01 | 10.01
Loans receivable at fair value, measurement input | 16.09 |
Significant unobservable inputs (Level 3) | Market approach | Minimum | Market interest rate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans receivable at fair value, measurement input | 0.100 |
Significant unobservable inputs (Level 3) | Market approach | Maximum | Multiple of EBITDA |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 13.0 | 10.5
Significant unobservable inputs (Level 3) | Market approach | Maximum | Multiple of Sales |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 3.3 |
Significant unobservable inputs (Level 3) | Market approach | Maximum | Market price of related security |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | $ / shares | 84.35 | 18.88
Loans receivable at fair value, measurement input | 21.18 |
Significant unobservable inputs (Level 3) | Market approach | Maximum | Market interest rate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans receivable at fair value, measurement input | 0.243 |
Significant unobservable inputs (Level 3) | Market approach | Weighted Average | Multiple of EBITDA |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 6.8 | 6.0
Loans receivable at fair value, measurement input |  | 4.5
Significant unobservable inputs (Level 3) | Market approach | Weighted Average | Multiple of Sales |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 0.8 | 3.0
Significant unobservable inputs (Level 3) | Market approach | Weighted Average | Market price of related security |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | $ / shares | 2.81 | 16.91
Loans receivable at fair value, measurement input | 16.83 |
Significant unobservable inputs (Level 3) | Market approach | Weighted Average | Operating income multiple |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Mandatorily redeemable noncontrolling interesting, measurement input | 6.0 | 6
Significant unobservable inputs (Level 3) | Discounted cash flow |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value | $ 65,297 | $ 57,267
Fair value | 523,232 | 694,499
Contingent consideration | $ 27,987 | $ 31,046
Significant unobservable inputs (Level 3) | Discounted cash flow | Market interest rate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input |  | 0.238
Significant unobservable inputs (Level 3) | Discounted cash flow | EBITDA volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent earnout, measurement input, percent | $ / shares | 0.70 | 0.800
Significant unobservable inputs (Level 3) | Discounted cash flow | Asset volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent earnout, measurement input, percent | 0.690 | 0.690
Significant unobservable inputs (Level 3) | Discounted cash flow | Minimum | Market interest rate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans receivable at fair value, measurement input |  | 0.060
Significant unobservable inputs (Level 3) | Discounted cash flow | Minimum | Annualized volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 0.250 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Maximum | Market interest rate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans receivable at fair value, measurement input |  | 0.835
Significant unobservable inputs (Level 3) | Discounted cash flow | Maximum | Annualized volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 1.830 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Weighted Average | Market interest rate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 0.237 | 0.238
Loans receivable at fair value, measurement input | 0.137 | 0.239
Significant unobservable inputs (Level 3) | Discounted cash flow | Weighted Average | EBITDA volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent earnout, measurement input, percent | $ / shares | 0.70 | 0.800
Significant unobservable inputs (Level 3) | Discounted cash flow | Weighted Average | Asset volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent earnout, measurement input, percent | 0.690 | 0.690
Significant unobservable inputs (Level 3) | Option pricing model |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value | $ 5,163 | $ 7,026
Significant unobservable inputs (Level 3) | Option pricing model | Minimum | Market interest rate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 0.202 |
Significant unobservable inputs (Level 3) | Option pricing model | Minimum | Annualized volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input |  | 0.003
Significant unobservable inputs (Level 3) | Option pricing model | Maximum | Market interest rate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 0.263 |
Significant unobservable inputs (Level 3) | Option pricing model | Maximum | Annualized volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input |  | 0.261
Significant unobservable inputs (Level 3) | Option pricing model | Weighted Average | Annualized volatility |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity securities, measurement input | 0.770 | 0.700

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