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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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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value of financial and nonfinancial obligations.

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