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Master Transactions and Cooperation Agreement with Brookdale ("Brookdale Transaction") - Fair Value Measurement Techniques and Quantitative Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
property
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Discount rate   12.00%    
Range of revenue growth rate   5.00%    
Rental and related revenues   $ 1,071,153 $ 1,159,791 $ 1,116,830
Operating expenses   $ 666,251 $ 738,399 $ 610,679
Minimum        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
EBITDAR growth rate   0.00%    
Real estate capitalization rates   6.00%    
Maximum        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
EBITDAR growth rate   3.00%    
Real estate capitalization rates   7.00%    
Assets Leased to Others | Senior housing triple-net        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Rental and related revenues $ (20,000)      
Number of assets with fair value impacts | property 32      
Assets Under Management Agreements | SHOP        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Number of assets with fair value impacts | property 36      
Operating expenses $ 35,000