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Dispositions and Impairment - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) term property | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) impairment_charge term property | Sep. 30, 2019 USD ($) | Dec. 31, 2019 property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of properties disposed | term | 135 |  | 135 |  |
Debt satisfaction gain |  |  | $ 29,016 | $ 4,415 |
Number of real estate properties held for sale | property | 5 |  | 5 |  | 0
Number of impairment charges | impairment_charge |  |  | 2 |  |
Asset impairment charges | $ 6,175 | $ 673 | $ 7,792 | 2,355 |
Properties in Charleston, SC and Overland Park, KS | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of properties disposed | property | 2 |  | 2 |  |
Transferred Property | Office Building |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Aggregate gross disposition price |  |  | $ 140,573 | 448,900 |
Sold Properties |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on sale of properties |  |  | 41,876 | 176,662 |
Houston, TX |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Asset impairment charges |  |  | 1,617 |  |
Watertown, New York |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Asset impairment charges |  |  |  | 2,106 |
Albany, Georgia |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Asset impairment charges |  |  |  | $ 249 |
Kalamazoo, Michigan |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Asset impairment charges |  |  | $ 6,175 |  |

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