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Concentration of Credit Risk (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 03, 2016
Lease
Oct. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
board_member
property
state
province
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Nov. 30, 2016
USD ($)
property
Concentration of credit risk              
Number of states | state       46      
Number of Canadian provinces | province       7      
Rental income       $ 1,476,176 $ 1,346,046 $ 1,138,457  
Gain on real estate dispositions       $ 98,203 $ 18,811 $ 19,183  
Ownership interests in properties accounted for under the equity method       5.00%      
Seniors Housing Communities              
Concentration of credit risk              
Number of properties included in investments in unconsolidated entities, pursuant to management agreement | property       1      
Atria              
Concentration of credit risk              
Ownership interests in properties accounted for under the equity method       34.00%      
Kindred | Skilled Nursing Facilities              
Concentration of credit risk              
Number of properties to be sold | property             36
Contingent selling price             $ 700,000
Total gross book value of properties | Skilled nursing facilities, hospitals, MOBs and other healthcare assets              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       38.20%      
Total gross book value of properties | Atria              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       22.60%      
Total gross book value of properties | Sunrise              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       11.30%      
Total gross book value of properties | Brookdale Senior Living              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       8.10%      
Total gross book value of properties | Kindred              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       1.80%      
Total gross book value of properties | Ardent              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       5.10%      
Total revenues or NOI | California              
Concentration of credit risk              
Number of states accounting for more than 10% of total revenues | state       1      
Total revenues | Brookdale Senior Living              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       4.80% 5.30% 6.10%  
Total revenues | Kindred              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       5.40% 5.70% 5.90%  
Total revenues | Ardent              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       3.10% 1.30%    
Total NOI | Brookdale Senior Living              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       8.30% 9.30% 10.90%  
Total NOI | Kindred              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       9.20% 9.90% 10.60%  
Total NOI | Ardent              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       5.30% 2.30%    
Minimum              
Concentration of credit risk              
Ownership interests in properties accounted for under the equity method         5.00%    
Minimum | Atria              
Concentration of credit risk              
Number of board members appointed | board_member       2      
Maximum              
Concentration of credit risk              
Ownership interests in properties accounted for under the equity method         25.00%    
Maximum | Atria              
Concentration of credit risk              
Number of board members appointed | board_member       6      
LTACS              
Concentration of credit risk              
Rental income     $ 3,500        
Lease modifications, number of properties | Lease 7            
Original expected annual lease income       $ 8,000      
Proceeds from sale of real estate   $ 3,000          
Gain on real estate dispositions   $ 2,900          
Triple-net leased properties | Total gross book value of properties | Seniors Housing Communities              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       25.30%      
Senior Living Operations | Total gross book value of properties | Seniors Housing Communities              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)       36.50%