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Subsequent Events (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Subsequent Event [Line Items]    
Net book value of real estate assets $ 11,142,239 $ 10,863,162
Preston Oaks [Member]    
Subsequent Event [Line Items]    
Net book value of real estate assets 28,300  
Net operating income $ 1,700 $ 2,000