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Investments in Real Estate - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Property | Sep. 30, 2017 USD ($) Property
Real Estate [Line Items] |  |  |  |
Net proceeds from sale of properties |  |  | $ 807,739 | $ 186,499
Debt satisfaction charges | $ 2,228 | $ (2,424) | 2,228 | (2,378)
Asset impairment charges | 2,542 | 21,986 | 90,860 | 43,577
Overland Park, Kansas [Member] |  |  |  |
Real Estate [Line Items] |  |  |  |
Asset impairment charges |  |  | 17,906 |
Office Building [Member] | Cash Held in Exchange Account [Member] |  |  |  |
Real Estate [Line Items] |  |  |  |
Restricted cash held in exchange account | 256,808 |  | 256,808 |
LCIF [Member] |  |  |  |
Real Estate [Line Items] |  |  |  |
Net proceeds from sale of properties |  |  | 206,929 | 7,106
Debt satisfaction charges | 832 | 0 | 832 | 0
Asset impairment charges | 0 | $ 6,802 | 23,938 | $ 12,061
LCIF [Member] | Overland Park, Kansas [Member] |  |  |  |
Real Estate [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] |  |  |  |
Real Estate [Line Items] |  |  |  |
Mortgages and notes payable | 32,297 |  | $ 32,297 |
LCIF [Member] | Industrial Property [Member] |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of properties sold | Property |  |  | 8 |
Net proceeds from sale of properties |  |  | $ 283,228 |
Loss (gain) on sale |  |  | (78,459) |
Debt satisfaction charges |  |  | 832 |
LCIF [Member] | Industrial Property [Member] | Cash Held in Exchange Account [Member] |  |  |  |
Real Estate [Line Items] |  |  |  |
Restricted cash held in exchange account | $ 80,137 |  | $ 80,137 |
LCIF [Member] | Office Building [Member] |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of properties sold | Property |  |  |  | 2
Net proceeds from sale of properties |  |  |  | $ 7,591

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