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Real Estate (Summary of NHC Percentage Rent) (Details) - National Healthcare Corporation [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Total percentage rent income $ 924 $ 853 $ 2,135 $ 1,991
Current year [Member]        
Total percentage rent income 924 853 1,801 1,706
Prior year final certification [Member]        
Total percentage rent income $ 0 $ 0 $ 334 $ 285