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Real Estate Investments, Net - Rental Income (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
operator
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Lessor, Lease, Description [Line Items]      
Contractual rent due $ 166,056    
Straight-line rent 1,385 $ 2,333 $ 344
Adjustment for collectibility of rental income (11,774)    
Total rental income $ 155,667    
Number of operators for which collectability not probable | operator 5    
Contractual rent      
Lessor, Lease, Description [Line Items]      
Adjustment for collectibility of rental income $ (7,800)    
Straight-line rent      
Lessor, Lease, Description [Line Items]      
Adjustment for collectibility of rental income (3,500)    
Property taxes      
Lessor, Lease, Description [Line Items]      
Adjustment for collectibility of rental income $ (500)