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Disposals of Operating Properties and Impairment Charge (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) property | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of real estate properties (in properties) | property |  | 0 |  |  | 0
Impairment charges | $ 0 | $ 25,107 |  | $ 0 | $ 29,184
Five Unnamed Impaired Properties |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of real estate properties (in properties) | property |  | 5 |  |  | 5
Impairment charges |  |  |  |  | $ 25,100
Real estate property, fair value disclosure |  | $ 152,900 |  |  | $ 152,900
Unnamed impaired property |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment charges |  |  | $ 4,100 |  |
Eight Operating Properties |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of real estate properties (in properties) | property |  | 8 |  |  | 8
Proceeds from sales of operating properties |  | $ 244,000 |  |  |
Disposal group, not discontinued operation, gain (loss) on disposal |  | $ 24,100 |  |  |
Whitehall Pike |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sales of operating properties |  |  | 13,500 |  |
Disposal group, not discontinued operation, gain (loss) on disposal |  |  | 6,600 |  |
Fair Value, Inputs, Level 3 | Unnamed impaired property |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Real estate property, fair value disclosure |  |  | $ 10,000 |  |

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