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Real Estate Transactions - U.K. Portfolio (Details)
$ in Thousands, £ in Millions
1 Months Ended
Aug. 31, 2018
GBP (£)
Jun. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Value of U.K. Portfolio     $ 12,899,501 $ 12,718,553  
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   $ 507,000     £ 382
Proceeds from divestiture of interest in joint venture   402,000      
Gain on disposal of interest in joint venture   11,000      
Cumulative foreign currency translation reclassification from OCI   $ 17,000      
U.K. Portfolio          
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%     49.00%
Fair value of investment   $ 105,000      
Development loan to MMCG          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of development loan receivables | £ £ 11