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Acquired Lease Intangibles (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of above and below Market Leases $ 13,965 $ 17,078 $ 13,847
Amortization of acquired in place leases $ 11,400 $ 14,400 $ 15,600