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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 ($)
Sep. 30, 2019
USD ($)
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     $ 14,010,210 $ 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]          
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        
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%