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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - MCB Real Estate, LLC (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2016 USD ($) | Oct. 31, 2016 | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Consolidated VIEs Carrying Amount of Assets and Liabilities |  |  |  |  |
Number of VIEs | item |  |  | 3 |  |
Investment in unconsolidated joint ventures |  |  | $ 10,833,000 | $ 11,350,000 |
Write-off of unbilled straight-line rent receivable |  |  |  | $ 89,000 |
Purchase of non-controlling interest |  |  | (446,000) |  |
Payment made to purchase partner's interest in consolidated joint venture |  |  | $ 446,000 |  |
Percentage of rental income |  |  | 1.00% | 1.00% | 1.00%
Mortgages payable |  |  | $ 394,898,000 | $ 331,055,000 |
Net book value of property |  |  | 2,628,000 |  |
Impairment charge |  |  | 0 | 0 | $ 1,093,000
Real estate expenses |  |  | $ 8,931,000 | 6,047,000 | $ 4,407,000
Consolidated JV |  |  |  |  |
Consolidated VIEs Carrying Amount of Assets and Liabilities |  |  |  |  |
Number of joint ventures with controlling interest | item |  |  | 5 |  |
Consolidated JV | Deptford, New Jersey |  |  |  |  |
Consolidated VIEs Carrying Amount of Assets and Liabilities |  |  |  |  |
Purchase of Minority Interest Percentage | 5.00% |  |  |  |
Equity Method Investment Ownership Percentage Control Obtained | 100.00% |  |  |  |
MCB Real Estate LLC And Its Affiliates | Consolidated JV |  |  |  |  |
Consolidated VIEs Carrying Amount of Assets and Liabilities |  |  |  |  |
Number of joint ventures with controlling interest | item |  |  | 4 |  |
Investment in unconsolidated joint ventures |  |  |  | 10,522,000 |
Investment in consolidated joint ventures |  |  | $ 10,522,000 |  |
MCB Real Estate LLC And Its Affiliates | Consolidated JV | Deptford, New Jersey |  |  |  |  |
Consolidated VIEs Carrying Amount of Assets and Liabilities |  |  |  |  |
Purchase of Minority Interest Percentage | 5.00% | 5.00% |  |  |
Equity Method Investment Ownership Percentage Control Obtained | 100.00% |  |  |  |
Payment made to purchase partner's interest in consolidated joint venture | $ 446,000 |  |  |  |
MCB Real Estate LLC And Its Affiliates | Consolidated JV | Pathmark supermarket in Philadelphia, Pennsylvania |  |  |  |  |
Consolidated VIEs Carrying Amount of Assets and Liabilities |  |  |  |  |
Write off of Intangible Lease Liabilities |  |  |  | 124,000 |
Write-off of unbilled straight-line rent receivable |  |  |  | 89,000 |
Write off of tenant origination costs |  |  |  | $ 380,000 |
Investment in consolidated joint ventures |  |  | 3,079,000 |  |
Percentage of rental income |  |  |  | 0.90% | 0.30%
Mortgages payable |  |  | 4,397,000 |  |
Net book value of property |  |  | 7,164,000 |  |
Impairment charge |  |  | 0 |  |
Real estate expenses |  |  | 299,000 | $ 93,000 | $ 0
Mortgage interest |  |  | 175,000 | 182,000 | $ 34,000
Increase in rental income |  |  |  | $ 35,000 |
Paid-in Capital |  |  |  |  |
Consolidated VIEs Carrying Amount of Assets and Liabilities |  |  |  |  |
Purchase of non-controlling interest |  |  | $ (436,000) |  |
Paid-in Capital | MCB Real Estate LLC And Its Affiliates | Consolidated JV | Deptford, New Jersey |  |  |  |  |
Consolidated VIEs Carrying Amount of Assets and Liabilities |  |  |  |  |
Purchase of non-controlling interest | $ 436,000 |  |  |  |

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