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Real Estate (Narrative) (Details) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 28, 2018 | Aug. 28, 2018 | Aug. 21, 2018 | Aug. 08, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Capital lease obligation |  |  |  |  | $ 5,398,000 |  | $ 5,398,000 |
Total revenues |  |  |  |  | $ 36,170,000 | $ 36,398,000 | 115,088,000 | $ 108,871,000
Impairment charges |  |  |  |  |  |  | $ 20,689,000 | $ 9,850,000
Land Parcel Adjacent To Riverview Plaza |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 1,000,000 |  |  |  |
Cash payments |  |  |  | $ 25,000 |  |  |  |
Number of OP Units issued |  |  |  | 208,000 |  |  |  |
Senator Square [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Capital lease obligation |  |  | $ 5,700,000 |  |  |  |  |
Capital Leases obligation interest rate |  |  | 5.30% |  |  |  |  |
Lease monthly payment |  |  | $ 75,000 |  |  |  |  |
Lease expiration date |  |  | Aug. 31, 2117 |  |  |  |  |
Duration required to earn fair value purchase option minimum |  |  | 25 years |  |  |  |  |
Duration required to earn fair value purchase option maximum |  |  | 33 years |  |  |  |  |
Duration interval between subsequent fair value purchase option |  |  | 10 years |  |  |  |  |
Lease terms |  |  | The lease initially requires monthly payments of $75,000 through maturity in August 2117 unless the Company exercises one of its options to acquire the land. The first such option will be available between the 25th and 33rd anniversaries of the lease, depending on certain property benchmarks, with additional purchase options every 10 years thereafter during the lease term. The lease also provides for 1.5% annual increases which begin on approximately the 8th anniversary of the lease, depending on the aforementioned property benchmarks. |  |  |  |  |
Lease annual increase percentage |  |  | 1.50% |  |  |  |  |
Lease period of aforementioned property benchmarks |  |  | 8 years |  |  |  |  |
Lease payment mnimum duration period required to adjustment purchase options |  |  | 25 years |  |  |  |  |
Lease payment maximum duration period required to adjustment purchase options |  |  | 50 years |  |  |  |  |
Interest only mortgage note receivable issued |  |  | $ 3,500,000 |  |  |  |  |
Interest only mortgage note receivable, interest rate |  |  | 4.50% |  |  |  |  |
Senator Square [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Mortgage note receivable maturity date |  |  | 26 years 6 months |  |  |  |  |
Senator Square [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Mortgage note receivable maturity date |  |  | 34 years 6 months |  |  |  |  |
Mechanicsburg Center [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Gain on sale of real estate |  | $ 4,900,000 |  |  |  |  |  |
Mechanicsburg Center [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Total revenues |  | $ 16,100,000 |  |  |  |  |  |
West Bridgewater Plaza [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Impairment charges | $ 9,400,000 |  |  |  |  |  |  |
West Bridgewater Plaza [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Total revenues | $ 3,500,000 |  |  |  |  |  |  |
Carll's Corner [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Location |  |  |  |  |  |  | Bridgeton, New Jersey |
Maxatawny Marketplace [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Location |  |  |  |  |  |  | Maxatawny, Pennsylvania |
Real Estate Held for Sale [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  | $ 11,300,000 |

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