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General (Details)
3 Months Ended 9 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
segment
Number of operating segments | segment     1
Provision for federal or state income taxes     $ 0
Remaining lease term (years)   5 years 5 years
Rent expense related to operating lease     $ 224,000
Right-of use asset   $ 1,354,000 1,354,000
Lease liability   1,354,000 1,354,000
Real estate taxes reimbursed   3,849,000 12,094,000
Cumulative effect of the adoption of the ASC 842 $ 42,808,000    
Rental income   38,665,000 114,566,000
Anthem, Thrive, Preferred Care and Senior Care      
Percentage of write-off of general straight-lint rent reserve 1.00%    
Rental income   26,135,000 26,135,000
Recovery of written-off straight-line rent receivable   $ 5,571,000 $ 22,542,000