ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measured on recurring basis (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 2,831
Net income attributable to noncontrolling interests	0
Distribution	(895)
Change in fair value	219
Balance, end of period	2,155
The amount of total income (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets and liabilities still held	(219)
Employment Agreement Award [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	25,660
Net income attributable to noncontrolling interests	0
Distribution	(2,861)
Change in fair value	3,575
Balance, end of period	26,374
The amount of total income (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets and liabilities still held	(3,575)
Redeemable Noncontrolling Interest [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	10,232
Net income attributable to noncontrolling interests	999
Distribution	0
Dividends paid to noncontrolling interests	(1,000)
Change in fair value	(984)
Balance, end of period	9,247
The amount of total income (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets and liabilities still held	$ 0