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Real Estate Properties - (Details) - USD ($)
$ in Thousands
1 Months Ended
Oct. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Real Estate Properties      
Real estate property, gross   $ 7,730,523 $ 7,456,940
Real estate property - accumulated depreciation   1,328,011 1,147,540
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2017   561,815  
2018   545,286  
2019   525,489  
2020   498,099  
2021   477,962  
Thereafter   2,626,668  
Land      
Real Estate Properties      
Real estate property, gross   803,773 781,426
Building improvements      
Real Estate Properties      
Real estate property, gross   6,620,158 6,391,482
Real estate property - accumulated depreciation   1,149,083 992,361
Furniture, fixtures and equipment      
Real Estate Properties      
Real estate property, gross   306,592 284,032
Real estate property - accumulated depreciation   $ 178,928 $ 155,179
OHIO | MOBs      
Real Estate Properties      
Below market, acquired lease amortization period 14 years 1 month 6 days