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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%