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MORTGAGES PAYABLE - Summary of Mortgages Payable (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 29, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 23, 2018 | Mar. 28, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Total mortgages payable, net of unamortized debt issuance costs |  | $ 1,550,242 | $ 1,564,542 |  |  |
Gain (loss) on extinguishment of debt |  | 2,524 | (35,336) | $ 0 |  |
Mortgages | First Mortgage |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total mortgages payable |  | 1,562,159 | 1,578,317 |  |  |
Unamortized debt issuance costs |  | (11,917) | (13,775) |  |  |
Total mortgages payable, net of unamortized debt issuance costs |  | 1,550,242 | 1,564,542 |  |  |
Mortgages | First Mortgage | Variable rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total mortgages payable |  | $ 169,500 | 169,500 |  |  |
Mortgages | First Mortgage | Variable rate | The Plaza at Cherry Hill |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.95% |  |  |  |
Total mortgages payable |  | $ 28,930 | $ 28,930 |  |  |
Mortgages | First Mortgage | Variable rate | The Plaza at Cherry Hill | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on variable rate |  | 160.00% | 160.00% |  |  |
Mortgages | First Mortgage | Variable rate | Westfield - One Lincoln Plaza |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.95% |  |  |  |
Total mortgages payable |  | $ 4,730 | $ 4,730 |  |  |
Mortgages | First Mortgage | Variable rate | Westfield - One Lincoln Plaza | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on variable rate |  | 160.00% | 160.00% |  |  |
Mortgages | First Mortgage | Variable rate | The Plaza at Woodbridge |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.95% |  |  |  |
Total mortgages payable |  | $ 55,340 | $ 55,340 |  |  |
Mortgages | First Mortgage | Variable rate | The Plaza at Woodbridge | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on variable rate |  | 160.00% | 160.00% |  |  |
Mortgages | First Mortgage | Variable rate | Hudson Commons |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.25% |  |  |  |
Total mortgages payable |  | $ 29,000 | $ 29,000 |  |  |
Mortgages | First Mortgage | Variable rate | Hudson Commons | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on variable rate |  | 190.00% |  |  |  |
Mortgages | First Mortgage | Variable rate | Watchung, NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.25% |  |  |  |
Total mortgages payable |  | $ 27,000 | 27,000 |  |  |
Mortgages | First Mortgage | Variable rate | Watchung, NJ | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on variable rate |  | 190.00% |  |  |  |
Mortgages | First Mortgage | Variable rate | Bronx (1750-1780 Gun Hill Road), NY |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.25% |  |  |  |
Total mortgages payable |  | $ 24,500 | 24,500 |  |  |
Mortgages | First Mortgage | Variable rate | Bronx (1750-1780 Gun Hill Road), NY | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on variable rate |  | 190.00% |  |  |  |
Mortgages | First Mortgage | Fixed rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total mortgages payable |  | $ 1,392,659 | 1,408,817 |  |  |
Mortgages | First Mortgage | Fixed rate | Montehiedra Town Center | Senior Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 5.33% |  |  |  |
Total mortgages payable |  | $ 84,860 | 86,236 |  |  |
Mortgages | First Mortgage | Fixed rate | Montehiedra Town Center | Junior Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.00% |  |  |  |
Total mortgages payable |  | $ 30,000 | 30,000 |  |  |
Mortgages | First Mortgage | Fixed rate | Bergen Town Center |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.56% |  |  |  |
Total mortgages payable |  | $ 300,000 | 300,000 |  |  |
Mortgages | First Mortgage | Fixed rate | Shops at Bruckner |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.90% |  |  |  |
Total mortgages payable |  | $ 11,582 | 12,162 |  |  |
Mortgages | First Mortgage | Fixed rate | Hudson Mall |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 5.07% |  |  |  |
Total mortgages payable |  | $ 24,326 | 25,004 |  |  |
Effective interest rate |  | 3.88% |  |  |  |
Unamortized debt premium |  | $ 1,200 | 1,500 |  |  |
Mortgages | First Mortgage | Fixed rate | Yonkers Gateway Center |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.16% |  |  |  |
Total mortgages payable |  | $ 31,704 | 33,227 |  |  |
Effective interest rate |  | 3.71% |  |  |  |
Unamortized debt premium |  | $ 700 | 800 |  |  |
Mortgages | First Mortgage | Fixed rate | Las Catalinas |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.43% |  |  |  |
Total mortgages payable |  | $ 130,000 | 130,000 |  |  |
Mortgages | First Mortgage | Fixed rate | Brick, NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.87% |  |  |  |
Total mortgages payable |  | $ 50,000 | 50,000 |  |  |
Mortgages | First Mortgage | Fixed rate | North Plainfield, NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.99% |  |  |  |
Total mortgages payable |  | $ 25,100 | 25,100 |  |  |
Mortgages | First Mortgage | Fixed rate | Middletown, NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.78% |  |  |  |
Total mortgages payable |  | $ 31,400 | 31,400 |  |  |
Mortgages | First Mortgage | Fixed rate | Rockaway |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.78% |  |  |  |
Total mortgages payable |  | $ 27,800 | 27,800 |  |  |
Mortgages | First Mortgage | Fixed rate | East Hanover (200 - 240 Route 10 West), NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.03% |  |  |  |
Total mortgages payable |  | $ 63,000 | 63,000 |  |  |
Mortgages | First Mortgage | Fixed rate | North Bergen (Tonnelle Avenue), NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 4.18% | 4.18% |  |  |  | 4.59%
Total mortgages payable | $ 100,000 | $ 100,000 | 100,000 |  |  | $ 74,000
Debt instrument, term | 10 years |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | (1,300) |  |  |
Prepayment penalty |  |  | 1,100 |  |  |
Write-off of unamortized deferred financing fees |  |  | 200 |  |  |
Mortgages | First Mortgage | Fixed rate | Manchester Plaza |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.32% |  |  |  |
Total mortgages payable |  | $ 12,500 | 12,500 |  |  |
Mortgages | First Mortgage | Fixed rate | Millburn |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.97% |  |  |  |
Total mortgages payable |  | $ 24,000 | 24,000 |  |  |
Mortgages | First Mortgage | Fixed rate | Totowa, NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.33% |  |  |  |
Total mortgages payable |  | $ 50,800 | 50,800 |  |  |
Mortgages | First Mortgage | Fixed rate | Woodbridge Commons |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.36% |  |  |  |
Total mortgages payable |  | $ 22,100 | 22,100 |  |  |
Mortgages | First Mortgage | Fixed rate | East Brunswick, NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.38% |  |  |  |
Total mortgages payable |  | $ 63,000 | 63,000 |  |  |
Mortgages | First Mortgage | Fixed rate | East Rutherford, NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.49% |  |  |  |
Total mortgages payable |  | $ 23,000 | 23,000 |  |  |
Mortgages | First Mortgage | Fixed rate | Hackensack, NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.36% |  |  |  |
Total mortgages payable |  | $ 66,400 | 66,400 |  |  |
Mortgages | First Mortgage | Fixed rate | Marlton, NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 3.86% |  |  |  |
Total mortgages payable |  | $ 37,400 | 37,400 |  |  |
Mortgages | First Mortgage | Fixed rate | East Hanover Warehouses |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.09% |  |  |  |
Total mortgages payable |  | $ 40,700 | 40,700 |  |  |
Mortgages | First Mortgage | Fixed rate | Union (2445 Springfield Avenue), NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.01% |  |  |  |
Total mortgages payable |  | $ 45,600 | 45,600 |  |  |
Mortgages | First Mortgage | Fixed rate | Freeport (437 East Sunrise Highway), NY |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.07% |  |  |  |
Total mortgages payable |  | $ 43,100 | 43,100 |  |  |
Mortgages | First Mortgage | Fixed rate | Garfield, NJ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 4.14% |  |  |  |
Total mortgages payable |  | $ 40,300 | 40,300 |  |  |
Mortgages | First Mortgage | Fixed rate | Mount Kisco (Target) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 6.40% |  |  |  |
Total mortgages payable |  | $ 13,987 | 14,451 |  |  |
Unamortized debt discount |  | $ (1,000) | (1,000) |  |  |
Effective interest rate |  | 7.30% |  |  |  |
Mortgages | First Mortgage | Fixed rate | Englewood |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 0.00% |  |  |  |
Total mortgages payable |  | $ 0 | $ 11,537 |  | $ 11,500 |
Gain (loss) on extinguishment of debt |  | $ 2,500 |  |  |  |

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