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RELATED-PARTY TRANSACTIONS (Details) - USD ($)	3 Months Ended		9 Months Ended
RELATED-PARTY TRANSACTIONS (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Sale of management notes receivable			$ 1,310,000	$ 0
Sale Of Notes Receivable
Related Party Transaction [Line Items]
Sale of management notes receivable	$ 1,300,000
HC Group Holdings I, LLC \| Loans Funded For Membership Unit Purchase
Related Party Transaction [Line Items]
Amount credited to paid-in capital for membership units sold and funded			0	400,000
Shareholder redemptions	0	$ 0	2,400,000	0
Cash distributions			2,000,000
Notes redeemed			400,000
Management
Related Party Transaction [Line Items]
Notes receivable	0		0		$ 1,600,000
Management \| Sale Of Notes Receivable
Related Party Transaction [Line Items]
Sale of management notes receivable	1,100,000
Accrued interest expense	200,000
Joint Venture
Related Party Transaction [Line Items]
Management fee income	600,000	$ 600,000	1,800,000	$ 1,600,000
Due to joint ventures	$ 3,100,000		$ 3,100,000		900,000
Due from joint ventures					$ 100,000