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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Amortization of below market leases and in-place leases) Table (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2015
Accounting Policies [Abstract]    
Revenues related to below market leases   $ 0.1
Amortization of in-place leases $ 1.3 $ 0.5