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Commitments and Contingencies Schedule of Lease Intangibles (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Unfavorable lease intangible liability $ (25,367) $ (34,989)
Above Market Leases    
Finite-Lived Intangible Assets [Line Items]    
Favorable lease intangible asset $ 53,429 $ 61,875