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Real Estate Transactions - U.K. Portfolio (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
GBP (£)
Dec. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Value of U.K. Portfolio $ 13,451,387 $ 13,451,387 $ 13,451,387     $ 14,088,461
Proceeds from divestiture of interest in joint venture     507,369 $ 0    
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 $ 507,000 $ 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% 49.00%   49.00%  
Investments, Fair Value Disclosure $ 105,000 $ 105,000 $ 105,000      
Development loan to MMCG            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Development loan held for sale | £         £ 11