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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of significant unobservable inputs of level 3 financial assets and liabilities (Details) $ in Thousands | Jun. 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 | $ 683,827 | $ 701,652
Total assets measured at fair value | 1,626,755 | 1,841,185
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 4,352 | 4,648
Contingent consideration | 27,724 | 31,046
Total liabilities measured at fair value | 34,762 | 41,764
Significant unobservable inputs (Level 3) |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value | 683,827 | 701,652
Total assets measured at fair value | 1,070,957 | 1,070,117
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 4,352 | 4,648
Contingent consideration | 27,724 | 31,046
Total liabilities measured at fair value | $ 32,076 | $ 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 | $ 309,614 | $ 304,172
Fair value | 23,848 | 7,153
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | $ 4,352 | $ 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 | Market price of related security |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans receivable at fair value, measurement input | 10.37 |
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 | 1.5 | 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 | 2.9 |
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
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 | 0.090 |
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 | 16.0 | 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 | 3.8 |
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 | 79.15 | 18.88
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 | 0.236 |
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 | 6.9 | 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 | 3.2 | 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 | 3.04 | 16.91
Loans receivable at fair value, measurement input | 10.37 |
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 | $ 66,218 | $ 57,267
Fair value | 659,979 | 694,499
Contingent consideration | $ 27,724 | $ 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 | 5.350 |
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 | 0.204 | 0.238
Loans receivable at fair value, measurement input | 0.169 | 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 | $ 11,298 | $ 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 | 0.135 |
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 | 0.208 |
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 | 0.950 | 0.700

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