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Real Estate Transactions - U.K. Portfolio (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended
Aug. 31, 2018
GBP (£)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
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       $ 13,083,958   $ 14,088,461
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   £ 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%  
Investments, Fair Value Disclosure   $ 105,000 $ 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