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Real Estate (Narrative) (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 19, 2019 | Aug. 21, 2018 | Aug. 08, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Real Estate Properties [Line Items] |  |  |  |  |  |
Purchase price |  |  |  | $ 9,083,000 | $ 179,000 | $ 32,442,000
Interest only mortgage note receivable issued |  |  |  | 3,500,000 | 3,500,000 |
Impairment charges |  |  |  | 8,938,000 | 20,689,000 | 9,538,000
Girard Plaza [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Purchase price | $ 8,500,000 |  |  |  |  |
Land Parcel Adjacent To Riverview Plaza [Member] |  |  |  |  |  |
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 minimum 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 |  |  |  |
West Bridgewater Plaza [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  |  | 9,400,000 |
Fredericksburg Way [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  |  |  | $ 9,500,000
Real Estate Held for Sale [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  | $ 8,900,000 | $ 11,300,000 |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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