MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses at beginning of period	$ 4,000	$ 3,400	$ 3,700	$ 3,100
Provision for loan losses	0	150	300	450
Provision for loan losses at end of period	$ 4,000	$ 3,550	$ 4,000	$ 3,550