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Summary of Significant Accounting Policies - Mortgage Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]    
Mortgage debt $ 532,563 $ 542,292
Deferred financing costs (2,240) (2,669)
Mortgage debt, net $ 530,323 $ 539,623