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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Investments in securities:
Investments in trading securities	$ 15,594		$ 15,342
Total assets measured at fair value	18,638		18,369
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,792	$ 4,369
Unrealized gains (losses) on private investments	0	(43)
Ending balance	2,792	$ 4,326
Fair Value Inputs [Abstract] (Deprecated 2018-01-31)
Long-term Investments	4,455		4,455
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value	11,841		12,901
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	$ (1,060)
Unobservable input - revenue retention discount rate - maximum	true
Unobservable input - revenue retention discount rate - weighted average	true
Unobservable input - revenue retention discount rate - minimum	true
Unobservable input - revenue retention volatility - weighted average	true
Unobservable input - revenue retention volatility - maximum	true
Unobservable input - revenue retention volatility - minimum	true
Unobservable input - growth discount rate - weighted average	true
Unobservable input - growth discount rate - maximum	true
Unobservable input - growth discount rate - minimum	true
Unobservable input - growth volatility - weighted average	true
Unobservable input - growth volatility - maximum	true
Unobservable input - growth volatility - minimum	true
Level 1
Investments in securities:
Investments in trading securities	$ 15,594		15,342
Total assets measured at fair value	15,594		15,342
Level 2
Investments in securities:
Investments in trading securities	0		0
Total assets measured at fair value	0		0
Level 3
Investments in securities:
Investments in trading securities	0		0
Total assets measured at fair value	$ 2,792		$ 2,792
Asset Acquisition, Consideration Transferred, Contingent Consideration	Level 3		Level 3
Other Liabilities, Fair Value Disclosure	$ 11,841		$ 12,901
Investments Measured at NAV
Investments in securities:
Investments in trading securities	0		0
Total assets measured at fair value	$ 252		$ 235
Fair Value, Recurring
Investments in securities:
Asset Acquisition, Consideration Transferred, Contingent Consideration	Fair Value, Inputs, Level 1, 2 and 3 [Member]		Fair Value, Inputs, Level 1, 2 and 3 [Member]
Private investment fund
Investments in securities:
Private	$ 252		$ 235
Private investment fund | Level 1
Investments in securities:
Private	0		0
Private investment fund | Level 2
Investments in securities:
Private	0		0
Private investment fund | Level 3
Investments in securities:
Private	0		0
Private investment fund | Investments Measured at NAV
Investments in securities:
Private	252		235
Private equity
Investments in securities:
Private	2,792		2,792
Private equity | Level 1
Investments in securities:
Private	0		0
Private equity | Level 2
Investments in securities:
Private	0		0
Private equity | Level 3
Investments in securities:
Private	2,792		2,792
Private equity | Investments Measured at NAV
Investments in securities:
Private	$ 0		$ 0

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