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Dispositions and Impairment - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2017 USD ($) | Sep. 30, 2018 USD ($) property | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) building property | Sep. 30, 2017 USD ($) Property | Dec. 31, 2017 property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on debt extinguishment on sale of properties, net |  |  |  | $ (1,698) | $ 2,381 |
Debt satisfaction amount |  |  |  |  | 3,496 |
Number of real estate properties held for sale | property |  | 6 |  | 6 |  | 1
Real estate impairment charges |  |  |  | $ 90,860 | 38,283 |
Asset impairment charges |  | $ 2,542 | $ 21,986 | 90,860 | 43,577 |
Impairment losses related to real estate partnerships | $ 5,294 |  |  |  |  |
Overland Park, Kansas [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  |  | 17,906 |  |
Kansas City, Missouri [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  |  | 5,591 |  |
Memphis, Tennessee [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  |  | 25,585 |  |
Overland Park, Kansas and Kansas City, Missouri [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Amount in excess of fair value |  | 25,060 |  | 25,060 |  |
Overland Park, Kansas and Kansas City, Missouri [Member] | Mortgages [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Mortgages and notes payable |  | 47,685 |  | 47,685 |  |
Office Building [Member] | Cash Held in Exchange Account [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Restricted cash held in exchange account |  | 256,808 |  | 256,808 |  |
Transferred Property [Member] | Office Building [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Aggregate gross disposition price |  |  |  | 967,799 | 190,368 |
Transferred Property [Member] | Office Building [Member] | NNN Office Joint Venture Properties [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Aggregate gross disposition price |  |  |  | $ 725,800 |  |
Number of properties sold | building |  |  |  | 21 |  |
Sold Properties [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on sale of properties |  |  |  | $ 239,577 | 55,078 |
LCIF [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Asset impairment charges |  | 0 | $ 6,802 | 23,938 | $ 12,061 |
LCIF [Member] | Overland Park, Kansas [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  |  | 17,906 |  |
Amount in excess of fair value |  | 19,072 |  | 19,072 |  |
LCIF [Member] | Overland Park, Kansas [Member] | Mortgages [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Mortgages and notes payable |  | $ 32,297 |  | $ 32,297 |  |
LCIF [Member] | Office Building [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of properties sold | Property |  |  |  |  | 2 |

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