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NOTES RECEIVABLE, PREFERRED EQUITY, AND OTHER REAL ESTATE RELATED INVESTMENTS Schedule of Notes Receivable (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2015 USD ($) | Dec. 31, 2015 USD ($) extension_option loan | Dec. 31, 2014 USD ($) loan | Jul. 31, 2015 USD ($) borrower loan | Jun. 30, 2015 USD ($) | May. 31, 2015 USD ($) | Apr. 30, 2015 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 147,188 |  | $ 102,286 |  |  |  |  |  | $ 126,656 | $ 129,278
152 - 154 Spring Street [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percent Owned |  |  |  |  |  |  |  | 10.00% |  |  |  |
Mezzanine Loan, 12.7% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [1],[2] |  | 12.70% |  |  |  |  |  |  |  |  |
First Priority Liens | [1] |  | $ 18,900 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 0 | [1] | 8,000 | [1] | $ 8,000 |  |  |  |  |
First Mortgage Loan, 8.8% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2] |  | 8.80% |  |  |  |  |  |  |  |  |
First Priority Liens |  |  | $ 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 7,500 |  | 7,500 |  |  |  |  |  |  |
Zero Coupon Loan, 24% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2],[3],[4] |  | 24.00% |  |  |  |  |  |  |  |  |
First Priority Liens | [3],[4] |  | $ 166,200 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 0 | [3],[4] | 4,986 | [3],[4] |  |  |  | $ 5,600 |  |
First Mortgage Loan, 5.5% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2] |  | 5.50% |  |  |  |  |  |  |  |  |
First Priority Liens |  |  | $ 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 4,000 |  | 4,000 |  |  |  |  |  |  |
Number of loan extensions | extension_option |  |  | 1 |  |  |  |  |  |  |  |  |
Length of loan extension |  |  | 6 months |  |  |  |  |  |  |  |  |
First Mortgage Loan, 6.0% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2] |  | 6.00% | [5] |  |  |  |  | 6.00% |  |  |
First Priority Liens | [5] |  | $ 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 15,000 | [5] | 0 | [5] |  |  | $ 15,000 |  |  |
Number of loan extensions | extension_option |  |  | 1 |  |  |  |  |  |  |  |  |
Length of loan extension |  |  | 12 months |  |  |  |  |  |  |  |  |
Preferred Equity, 13.5% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2] |  | 13.50% |  |  |  |  |  |  |  |  |
First Priority Liens |  |  | $ 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | 4,000 |  | 4,000 |  |  |  |  |  |  |
Other Loan, 17% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2],[6] |  |  |  |  |  |  | 17.00% |  |  |  |
First Priority Liens | [6] |  | 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 0 | [6] | 0 | [6] |  | $ 6,500 |  |  |  |
Other Loan, 18% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2],[7] |  | 18.00% |  |  |  |  |  |  |  |  |
First Priority Liens | [7] |  | $ 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable | [7] |  | 3,907 |  | 3,307 |  |  |  |  |  |  |
Payments to Acquire Loans Receivable |  |  | $ 600 |  |  |  |  |  |  |  |  |
Preferred Equity, 8.1% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2] |  | 8.10% |  |  |  |  |  |  |  |  |
First Priority Liens |  |  | $ 20,855 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 13,000 |  | 13,000 |  |  |  |  |  |  |
First Mortgage Loan, 7.1% LIBOR Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | [2],[8] |  | 7.10% |  |  |  |  |  |  |  |  |
First Priority Liens | [8] |  | $ 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 26,000 | [8] | 0 | [8] |  | $ 26,000 |  |  |  |
Number of loan extensions | extension_option |  |  | 1 |  |  |  |  |  |  |  |  |
Length of loan extension |  |  | 12 months |  |  |  |  |  |  |  |  |
Zero Coupon Loan, 2.5% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2],[4],[9] |  |  |  |  |  |  | 2.50% |  |  |  |
First Priority Liens | [4],[9] |  | $ 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 30,234 | [4],[9] | 0 | [4],[9] |  | $ 29,800 |  |  |  |
Mezzanine, 15% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2] |  | 15.00% |  |  |  |  |  |  |  |  |
First Priority Liens |  |  | $ 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 30,879 |  | 30,879 |  |  |  |  |  |  |
Other Loan, 2.5% LIBOR Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | [2] |  | 2.50% |  |  |  |  |  |  |  |  |
First Priority Liens |  |  | $ 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 0 |  | 4,000 |  |  |  |  |  |  |
Mezzanine Loan, 10.0% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2],[10] |  | 10.00% |  |  |  |  |  |  |  |  |
First Priority Liens | [10] |  | $ 87,477 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable | [10] |  | $ 0 |  | 7,983 |  |  |  |  |  |  |
Number of cross-collateralized loans | loan |  |  |  |  |  |  | 3 |  |  |  |  |
Number of borrowers | borrower |  |  |  |  |  |  | 1 |  |  |  |  |
First Mortgage, 7.7% Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | [2],[11] |  | 7.70% |  |  |  |  |  |  |  |  |
First Priority Liens | [11] |  | $ 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable | [11] |  | 12,000 |  | 12,000 |  |  |  |  |  |  |
Individually Less Than 3%, Variable Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
First Priority Liens | [12],[13],[14] |  | 0 |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  | $ 668 | [12],[13],[14] | $ 2,631 | [12],[13],[14] |  | $ 1,900 |  |  |  |
Number of loans | loan |  |  | 1 |  | 3 |  |  |  |  |  |  |
Payments to Acquire Loans Receivable |  | $ 400 |  |  |  |  |  |  |  |  |  |
Individually Less Than 3%, Variable Interest Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | [2],[12],[13],[14] |  | 2.50% |  |  |  |  |  |  |  |  |
Individually Less Than 3%, Variable Interest Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | [2],[12],[13],[14] |  | 11.60% |  |  |  |  |  |  |  |  |
[1] | During July 2015, the Company received repayment in full of this $8.0 million note.
[2] | Includes origination and exit fees
[3] | During April 2015, the Company converted a $5.6 million loan into an equity interest in the Route 202 Shopping Center (Note 2).
[4] | The principal balances for these accrual-only loans are increased by the interest accrued.
[5] | During May 2015, the Company made a $15.0 million loan, which is collateralized by a property, bears interest at 6.0% and matures May 1, 2016.
[6] | During June 2015, the Company made a $6.5 million loan, which bore interest at 17.0% and was scheduled to mature June 1, 2016. During October 2015, this loan was converted into an equity interest in 650 Bald Hill Road (Note 2).
[7] | During 2015, the Company advanced an additional $0.6 million on this loan collateralized by a property.
[8] | During June 2015, the Company made a $26.0 million loan, which is collateralized by a property.
[9] | During June 2015, the Company made a $29.8 million loan in connection with the disposition of City Point's Phase III (Note 2), which is collateralized by the purchaser's interest in the property.
[10] | Comprised of three cross-collateralized loans from one borrower, which were non-performing. During July 2015, the Company received repayment of these notes in full as well as all accrued interest and default interest and additional penalties.
[11] | Loan was non-performing as of December 31, 2015. Based on the value of the underlying collateral, no reserve has been established against this loan.
[12] | Consists of one loan as of December 31, 2015 and three loans as of December 31, 2014.
[13] | During February 2015, the Company advanced an additional $0.4 million on this loan collateralized by a property.
[14] | During June 2015, the Company converted a $1.9 million loan into an equity interest in the remaining 10% of 152-154 Spring Street.

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