LOANS RECEIVABLE AND OTHER INVESTMENTS - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	10
Outstanding principal balance	$ 54,134	$ 53,596
Loan loss reserve	$ 4,096	2,750
Nonperforming Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	5
Outstanding principal balance	$ 36,300	36,400
Loan loss reserve in period	$ 1,500
Number of loans on which provision for losses were recorded | loan	3
Number of loan receivable investments, nonaccrual status | loan	5
Value of loans on nonaccrual status	$ 36,300
Specific Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan loss reserve in period		2,300
Loan loss reserve	3,900
Portfolio-Based Loan Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan loss reserve in period		$ 400
Decrease in provision	200
Loan loss reserve	$ 200