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Dispositions and Impairment - Additional Information (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2019 USD ($) | Dec. 31, 2018 property | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Aggregate gain on sale of properties |  |  | $ 139,039 | $ 250,889 | $ 252,913
Number of real estate properties | property |  |  | 130 |  |
Properties classified as held-for-sale (in number of properties) | property |  |  | 2 | 0 |
Asset impairment charges |  |  | $ 14,460 | $ 5,329 | 95,813
Number of impaired properties | property |  |  | 4 |  |
Properties Conveyed to Lenders |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of real estate properties | property |  |  | 3 |  |
Gain (loss) on debt extinguishment on sale of properties |  |  | $ 34,450 |  |
Disposal Group, Disposed of by Sale, not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sale of property |  |  | 432,843 | 504,118 | 898,514
Aggregate gain on sale of properties |  |  | 139,039 | 250,889 | 252,913
Gain (loss) on debt extinguishment on sale of properties |  |  | $ 2,879 | 4,415 | $ 1,698
Office Building |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Aggregate gain on sale of properties | $ 824 |  |  |  |
Number of properties sold | property |  | 6 |  |  |
Asset impairment charges |  |  |  | 2,974 |
Number of impaired properties | property |  |  |  |  | 2
Impairment of assets held-for-use |  |  |  |  | $ 23,496
Retail Property |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Asset impairment charges |  |  |  | $ 2,106 |
Number of impaired properties | property |  |  |  | 2 |
Properties Held at Fiscal Year End |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of assets held-for-use |  |  |  |  | $ 36,620
NNN Office Joint Venture Properties |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Aggregate gain on sale of properties |  |  |  | $ 3,529 |
NNN Office Joint Venture Properties | Transferred Property | Office Building | 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 sold | building |  |  |  |  | 21

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