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Acquisitions, Dispositions and Other Significant Transactions - Dispositions of Owned Communities and Assets Held for Sale (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
community
Mar. 31, 2017
USD ($)
community
Dec. 31, 2017
USD ($)
community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain (loss) on sale of assets, net $ 43,431 $ (603)  
Assets held for sale 88,505   $ 106,435
Resident fee revenue 906,266 1,016,927  
Facility operating expenses $ 632,325 $ 674,542  
Sale of 3 communities [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of communities disposed of | community     3
Net cash proceeds     $ 8,200
43 Communities Disposed Of By Lease Terminations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of communities disposed of | community     43
26 Communities Disposed Of By Lease Terminations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of communities disposed of | community     26
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | 15 Communities Held For Sale [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of communities classified as held for sale | community   15  
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Three Communities [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of communities disposed of | community 3    
Net cash proceeds $ 12,800    
Gain (loss) on sale of assets, net $ 1,900    
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | 14 Communities Held For Sale [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of communities classified as held for sale | community 14    
Assets held for sale $ 88,500    
Resident fee revenue 9,100 $ 9,500  
Facility operating expenses $ 8,000 $ 7,700  
Assisted Living [Member] | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | 14 Communities Held For Sale [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of communities classified as held for sale | community 12    
CCRCs Rental [Member] | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | 14 Communities Held For Sale [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of communities classified as held for sale | community 2    
Mortgages [Member] | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | 14 Communities Held For Sale [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Mortgage debt $ 30,000   $ 30,100