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Investments In Direct Financing Lease (Future Minimum Rentals Receivable) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Capital Leases, Net Investment in Direct Financing Leases [Abstract]    
2018 $ 555  
2019 2,265  
2020 2,333  
2021 2,403  
2022 2,475  
Thereafter 26,876  
Total $ 36,907 $ 112,411