MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses at beginning of period	$ 3,400	$ 2,800	$ 3,100	$ 2,500
Provision for loan losses	150	150	450	450
Charge-offs	0	0	0	0
Provision for loan losses at end of period	$ 3,550	$ 2,950	$ 3,550	$ 2,950