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Real Estate Transactions - Held for Sale (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Assets held for sale, net $ 10,842 $ 108,086
Accumulated depreciation 2,915,798 2,842,947
Held-for-sale    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Assets held for sale, net $ 11,000 $ 108,000
Held-for-sale | SHOP    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of properties classified as held for sale (in properties) | property 1 9
Held-for-sale | Medical office    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of properties classified as held for sale (in properties) | property 2  
Held-for-sale | Life science    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of properties classified as held for sale (in properties) | property   1
Held-for-sale | Real Estate    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Assets held for sale, net $ 10,000 $ 101,000
Accumulated depreciation $ 5,000 $ 30,000