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Net Investment in Direct Financing Leases - Future Minimum Lease Payments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Leases, Capital [Abstract]  
2018 $ 102,983
2019 68,204
2020 62,781
2021 63,175
2022 57,762
Thereafter 707,547
Total $ 1,062,452