LOANS RECEIVABLE AND OTHER INVESTMENTS - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Investment loan	Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	$ 53,596	$ 274,484
Number of loans | Investment	10
Loan loss reserve	$ 2,750	4,300
Forest Park - Dallas and Fort Worth [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds received	196,100
Outstanding principal balance	170,800
Accrued and unpaid interest and fees	25,300
Nonperforming Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	$ 17,400	30,000
Number of loans | loan	3
Provision for loan losses	$ 3,100
Number of loans on which provision for losses were recorded | loan	4
Number of loans partially repaid prior to year end with on which provision for losses were recorded | loan	1
Number of loans on nonaccrual status | loan	4
Value of loans on nonaccrual status	$ 31,200
Portfolio-Based Loan Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses		2,600
Decrease in provision	1,300
Loan loss reserve	2,300
Specific Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses		$ 1,800
Loan loss reserve	$ 400