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COMMITMENTS AND CONTINGENCIES (Details) ft² in Thousands |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 19, 2019 USD ($) | Oct. 24, 2018 USD ($) ft² property | Oct. 15, 2018 USD ($) ft² property | Mar. 14, 2018 USD ($) property | Dec. 31, 2018 USD ($) ft² property mall | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Aug. 06, 2018 ft² property | Sep. 20, 2017 mall
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Real estate redevelopment in process |  |  |  |  | $ 196,500,000 |  |  |  |
Estimated cost to complete development and redevelopment projects |  |  |  |  | $ 50,500,000 |  |  |  |
Development in process, estimated duration to complete |  |  |  |  | 2 years |  |  |  |
Insurance coverage, general liability insurance, limit per occurrence |  |  |  |  | $ 200,000,000 |  |  |  |
Insurance coverage, rental value insurance, limit per occurrence |  |  |  |  | 500,000,000 |  |  |  |
Insurance coverage, terrorism acts insurance, limit per occurrence |  |  |  |  | 5,000,000 |  |  |  |
Casualty and impairment loss |  |  |  |  | 5,574,000 | $ 5,637,000 | $ 0 |  |
Provision (reversal) of provision for doubtful accounts |  |  |  |  | 4,138,000 | 3,445,000 | $ 1,214,000 |  |
Accrued environmental remediation costs |  |  |  |  | $ 1,700,000 | 1,200,000 |  |  |
Number of properties subject to lease | property |  |  |  |  | 24 |  |  |  |
Area of real estate property (in sq ft) | ft² |  |  |  |  | 16,300 |  |  |  |
Toys “R” Us | Property Subject to Operating Lease |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of properties subject to lease | property |  |  |  | 9 |  |  |  |  |
Annual gross rents |  |  |  | $ 7,600,000 |  |  |  |  |
Sears (Kmart) | Property Subject to Operating Lease |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of properties subject to lease | property |  |  | 4 |  |  |  |  |  |
Area of real estate property (in sq ft) | ft² |  |  | 547 |  |  |  |  |  |
Annual gross rents |  |  | $ 8,500,000 |  |  |  |  |  |
Sears (Kmart) | Property Subject to Operating Lease | Subsequent Event |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Consideration receivable on sales of stores under bankruptcy proceedings by lessee | $ 5,200,000,000 |  |  |  |  |  |  |  |
National Wholesale Liquidators | Property Subject to Operating Lease |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of properties subject to lease | property |  | 1 |  |  |  |  |  |  |
Area of real estate property (in sq ft) | ft² |  | 171 |  |  |  |  |  |  |
Annual gross rents |  | $ 3,100,000 |  |  |  |  |  |  |
Write-off of receivables from straight-line rents and reserves |  |  |  |  | $ 800,000 |  |  |  |
Environmental Remediation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Cost of services, environmental remediation |  |  |  |  | 600,000 |  |  |  |
Hudson Mall in Jersey City, NJ and Bruckner Commons in the Bronx, NY [Member] | Toys “R” Us | Property Leased by Customer in Bankruptcy |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from lease payments |  |  |  |  | 15,500,000 |  |  |  |
Woodbridge, NJ, Union, NJ, Amherst, NY and Wilkes-Barre, PA, Cherry Hill, NJ and Salem, NH | Toys “R” Us | Property Leased by Customer in Bankruptcy |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Annual gross rents |  |  |  |  | 5,700,000 |  |  |  |
Write-off of below-market lease intangible |  |  |  |  | 21,600,000 |  |  |  |
Write-off of receivables from straight-line rents and reserves |  |  |  |  | 1,000,000 |  |  |  |
Bronx (Shops at Bruckner), NY | Fallas | Property Subject to Operating Lease |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of properties subject to lease | property |  |  |  |  |  |  |  | 1 |
Area of real estate property (in sq ft) | ft² |  |  |  |  |  |  |  | 38 |
Annual gross rents |  |  |  |  | 1,400,000 |  |  |  |
Write-off of below-market lease intangible |  |  |  |  | $ 800,000 |  |  |  |
Puerto Rico |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of malls | mall |  |  |  |  | 2 |  |  |  |
Puerto Rico | Hurricane Maria | Hurricane |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of malls | mall |  |  |  |  |  |  |  |  | 2
Casualty and impairment loss |  |  |  |  |  | 2,200,000 |  |  |
Hurricane-related expenses |  |  |  |  |  | 1,700,000 |  |  |
Loss contingency, insurance proceeds received |  |  |  |  | $ 1,500,000 |  |  |  |
Rent abatements and tenant expense reimbursements |  |  |  |  | 700,000 | 900,000 |  |  |
Provision (reversal) of provision for doubtful accounts |  |  |  |  | (400,000) | 1,300,000 |  |  |
Puerto Rico | Hurricane Maria | Hurricane | Business Interruption |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Hurricane-related expenses |  |  |  |  | 300,000 |  |  |  |
Net casualty gains |  |  |  |  | 1,200,000 |  |  |  |
Business interruption losses |  |  |  |  | 300,000 | 2,200,000 |  |  |
Cash advance received from insurance |  |  |  |  |  | $ 1,800,000 |  |  |
Puerto Rico | Montehiedra Town Center and Las Catalinas Mall | Hurricane Maria |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Insurance coverage, rental value insurance, limit per occurrence |  |  |  |  | $ 139,000,000 |  |  |  |

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