STRUCTURED FINANCING PORTFOLIO - Schedule of Notes Receivable (Details) $ in Thousands	1 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) debtinstrument	Feb. 29, 2016 USD ($)	Sep. 30, 2016 USD ($) debtinstrument extension_option	Sep. 30, 2015 USD ($)	Apr. 30, 2016 USD ($)	Jan. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Mortgage Loans on Real Estate [Line Items]
Net carrying amounts of notes receivable	$ 266,816		$ 266,816				$ 147,188
Proceeds from notes receivable			$ 42,819	$ 15,984
Nonperforming Financing Receivable
Mortgage Loans on Real Estate [Line Items]
Number of instruments held | debtinstrument	1		1
First Mortgagee Loan, 7% Loan, Due 2016
Mortgage Loans on Real Estate [Line Items]
Effective interest rate	7.00%		7.00%			7.00%
Net carrying amounts of notes receivable	$ 0		$ 0			$ 13,300	0
Proceeds from notes receivable	13,800
Principal payment amount	13,300
Proceeds from interest received	$ 500
First Mortgage Loan, 8.8% Loan, Due 2016
Mortgage Loans on Real Estate [Line Items]
Effective interest rate	8.80%		8.80%
Net carrying amounts of notes receivable	$ 0		$ 0				7,500
Principal payment amount		$ 7,500
First Mortgage Loan, 6% Loan, Due 2017
Mortgage Loans on Real Estate [Line Items]
Effective interest rate	6.00%		6.00%
Net carrying amounts of notes receivable	$ 15,000		$ 15,000				15,000
Preferred Equity, 8.1% Loan, Due 2017
Mortgage Loans on Real Estate [Line Items]
Effective interest rate	8.10%		8.10%
Net carrying amounts of notes receivable	$ 0		$ 0				13,000
Proceeds from notes receivable		13,400
Principal payment amount		13,000
Prepayment penalty		$ 400
First Mortgage Loan LIBOR Plus 7.1% Due 2018
Mortgage Loans on Real Estate [Line Items]
Net carrying amounts of notes receivable	$ 26,000		$ 26,000				26,000
Extension options | extension_option			1
Extension options, length of term			12 months
First Mortgage Loan LIBOR Plus 7.1% Due 2018 | LIBOR
Mortgage Loans on Real Estate [Line Items]
Loans receivable, basis spread on variable rate	7.10%		7.10%
First Mortgage Loan, 8.1% Loan, Due 2019
Mortgage Loans on Real Estate [Line Items]
Effective interest rate	8.10%		8.10%		15.00%
Net carrying amounts of notes receivable	$ 153,400		$ 153,400		$ 30,900		30,879
Preferred Equity, 8.0% Loan, Due 2019
Mortgage Loans on Real Estate [Line Items]
Effective interest rate	8.70%		8.70%
Net carrying amounts of notes receivable	$ 10,000		$ 10,000				0
State interest rate	8.00%
Extension options | extension_option			1
Extension options, length of term			12 months
Zero Coupon, 2.5% Loan, Due 2020
Mortgage Loans on Real Estate [Line Items]
Effective interest rate	2.50%		2.50%
Net carrying amounts of notes receivable	$ 30,810		$ 30,810				30,234
Preferred Equity, 15.3% Loan, Due 2021
Mortgage Loans on Real Estate [Line Items]
Effective interest rate	15.30%		15.30%			15.30%
Mortgage Loans on Real Estate, Period Increase (Decrease)	$ 1,300
Net carrying amounts of notes receivable	$ 15,250		$ 15,250			$ 14,000	0
Extension options | extension_option			2
Extension options, length of term			12 years
First Mortgage Loan, 9.0% Demand Loan
Mortgage Loans on Real Estate [Line Items]
Effective interest rate	9.00%		9.00%
Net carrying amounts of notes receivable	$ 12,000		$ 12,000				12,000
Individually Less Than 3 Percent, Variable Interest Rate
Mortgage Loans on Real Estate [Line Items]
Threshold to disclose debt individually	3.00%		3.00%
Effective interest rate	18.00%		18.00%
Net carrying amounts of notes receivable	$ 4,356		$ 4,356				12,575
Carrying Amount
Mortgage Loans on Real Estate [Line Items]
Notes receivable and preferred equity investments, net	$ 266,816		$ 266,816				$ 147,188