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Dispositions and Impairment - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 USD ($) | Mar. 31, 2018 USD ($) property | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net proceeds from sale of properties |  | $ 61,518 | $ 90,823 |
Number of real estate properties held for sale | property |  | 0 |  | 1
Assets held for sale |  |  |  | $ 2,827
Real estate impairment charges |  | $ 53,049 | 2,698 |
Asset impairment charges |  | 53,049 | 7,992 |
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 |  |
Mortgage loans on real estate |  | 32,591 |  |
Amount in excess of fair value |  | 19,366 |  |
Memphis, Tennessee [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Asset impairment charges |  | 25,433 |  |
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 |  | 62,675 | 92,756 |
Sold Properties [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on sale of properties |  | 22,774 | 34,193 |
LCIF [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net proceeds from sale of properties |  | 2,101 | 3,889 |
Asset impairment charges |  | 22,730 | 2,497 |
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 |  |
Mortgage loans on real estate |  | 32,591 |  |
Amount in excess of fair value |  | 19,366 |  |
LCIF [Member] | Industrial Property [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net proceeds from sale of properties |  | 2,300 |  |
Loss (gain) on sale |  | $ (930) |  |
LCIF [Member] | Office Building [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net proceeds from sale of properties |  |  | 4,130 |
Loss (gain) on sale |  |  | $ 2,497 |

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