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Real Estate Transactions - U.K. Portfolio (Details) $ in Thousands, £ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 GBP (£) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Value of U.K. Portfolio | $ |  | $ 14,067,571 | $ 14,088,461
Forecast | Disposed of by Sale | U.K. Portfolio |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Ownership interest percentage selling | 51.00% |  |
Value of U.K. Portfolio | £ | £ 394 |  |
U.K. Portfolio | Forecast |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Percentage of noncontrolling interest in the joint venture | 49.00% |  |

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