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Revenues (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Lessor Lease Description [Line Items] |  |  |  |  |
Payment accepted on termination of lease prior to contractual expiration | $ 4,300,000 |  |  |  |
Total revenues |  | $ 36,170,000 | $ 36,398,000 | $ 115,088,000 | $ 108,871,000
Contract Termination [Member] |  |  |  |  |
Lessor Lease Description [Line Items] |  |  |  |  |
Total revenues |  |  |  | 5,400,000 |
Cash payment reduced by straight line rent receivable |  |  |  | 500,000 |
Accelerated Intangible Lease Liability Amortization [Member] | Contract Termination [Member] |  |  |  |  |
Lessor Lease Description [Line Items] |  |  |  |  |
Total revenues |  |  |  | 1,500,000 |
Other Income [Member] | Contract Termination [Member] |  |  |  |  |
Lessor Lease Description [Line Items] |  |  |  |  |
Total revenues |  |  |  | $ 3,800,000 |

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