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Revenues (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Lessor Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payment accepted on termination of lease prior to contractual expiration | $ 4,300,000 |  |  |  |  |  |  |  |  |  |  | $ 4,300,000 |
Total revenues |  |  | $ 35,628,000 | $ 35,912,000 | $ 35,660,000 | $ 36,883,000 | $ 36,932,000 | $ 36,170,000 | $ 41,350,000 | $ 37,568,000 | $ 144,083,000 | 152,020,000 | $ 146,008,000
Impairment charges |  |  |  |  |  |  |  |  |  |  | 8,938,000 | 20,689,000 | 9,538,000
Expense recoveries |  |  |  |  |  |  |  |  |  |  | $ 34,400,000 | 34,100,000 | $ 32,100,000
Contract Termination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  | 5,400,000 |
Cash payment reduced by straight line rent receivable |  |  |  |  |  |  |  |  |  |  |  | 500,000 |
Contract Termination [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  | $ 7,500,000 |  |  |  |  |  |  |  |  |  |  |
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 |
Other Income [Member] | Contract Termination [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ 7,100,000 |  |  |  |  |  |  |  |  |  |  |

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