ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measured on recurring basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Employment Agreement Award [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 25,603	$ 27,017
Net income attributable to redeemable noncontrolling interests	0	0
Dividends paid to redeemable noncontrolling interests	0	0
Distribution	(3,573)	(3,685)
Change in fair value	6,163	2,271
Balance, end of period	28,193	25,603
The amount of total (losses)/income for the period included in earnings attributable to the change in unrealized losses/income relating to assets and liabilities still held at the reporting date	(6,163)	(2,271)
Redeemable Noncontrolling Interest [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	12,701	10,564
Net income attributable to redeemable noncontrolling interests	2,315	1,544
Dividends paid to redeemable noncontrolling interests	2,400	2,802
Distribution	0	0
Change in fair value	4,399	3,395
Balance, end of period	17,015	12,701
The amount of total (losses)/income for the period included in earnings attributable to the change in unrealized losses/income relating to assets and liabilities still held at the reporting date	0	0
Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	780	1,921
Net income attributable to redeemable noncontrolling interests	0	0
Dividends paid to redeemable noncontrolling interests	0	0
Distribution	(1,060)	(1,188)
Change in fair value	280	47
Balance, end of period	0	780
The amount of total (losses)/income for the period included in earnings attributable to the change in unrealized losses/income relating to assets and liabilities still held at the reporting date	$ (280)	$ (47)