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Summary of Significant Accounting Policies - Mortgage Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Mortgage debt $ 508,454 $ 532,563
Deferred financing costs (2,138) (2,240)
Mortgage debt, net $ 506,316 $ 530,323