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Dispositions and Impairment - Additional Information (Details) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 USD ($) | Dec. 31, 2018 Property property | Feb. 28, 2017 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) Property | Dec. 31, 2018 USD ($) building Property | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  | $ 504,118 | $ 898,514 | $ 223,853
Aggregate gain on sale of properties |  |  |  |  | 250,889 | 252,913 | 63,428
Gain (loss) on debt extinguishment on sale of properties |  |  |  |  | $ (4,415) | $ (1,698) | 5,938
Properties classified as held-for-sale (in number of properties) | Property |  | 2 |  |  | 0 | 2 |
Other asset impairment charges |  |  |  |  | $ 5,329 | $ 95,813 | 39,702
Impairment charges and loan losses |  |  |  |  | 2,974 | 36,620 |
Impairment losses related to real estate partnerships |  |  | $ 5,294 |  |  |  |
Office Building |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Aggregate gain on sale of properties |  |  | $ 1,777 |  |  |  |
Number of properties sold | property |  | 6 |  |  |  |  |
Asset impairment charges |  |  |  |  |  | 23,496 | 15,008
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 | $ 824 |  |  |  | 3,529 |  |
NNN Office Joint Venture Properties | Transferred Property | Office Building |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  | $ 725,800 |
Number of properties sold | building |  |  |  |  |  | 21 |
Watertown, New York |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  | $ 2,106 |  | $ 18,023
Albany, Georgia |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Asset impairment charges |  |  |  | $ 249 |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
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