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Real Estate Investments - Investment in Direct Financing Leases, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Real Estate [Abstract]    
Future minimum lease payments receivable $ 14,195 $ 17,147
Unguaranteed residual value of property 23,146 27,450
Unearned income (3,939) (5,142)
Net investment in direct financing leases $ 33,402 $ 39,455