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Real Estate Investments - Investment in Direct Financing Leases, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Real Estate [Abstract]    
Future minimum lease payments receivable $ 17,147 $ 21,993
Unguaranteed residual value of property 27,450 31,562
Unearned income (5,142) (7,243)
Net investment in direct financing leases $ 39,455 $ 46,312