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Dispositions of Real Estate and Discontinued Operations - U.K. Portfolio (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2018
GBP (£)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2018
GBP (£)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Assets           $ 12,718,553 $ 14,088,461 $ 15,759,265  
Gain (loss) on sales of real estate, net     $ 95,000 $ 25,000   $ 925,985 $ 356,641 $ 164,698  
U.K. Portfolio                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Interest sold   51.00%              
Assets   $ 507,000   507,000         £ 382
Gross proceeds   402,000              
Gain (loss) on sales of real estate, net         $ 11,000        
Foreign currency translation reclassified from OCI   17,000              
Maria Mallaband Care Group loan                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Proceeds from sale of receivables | £ £ 11                
U.K. Portfolio                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Investments   $ 105,000   $ 105,000          
U.K. Portfolio                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Noncontrolling interest (as a percent)   49.00%   49.00%         49.00%