Acquired Lease Intangibles (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of above and below Market Leases	$ 15,618	$ 13,965	$ 17,078
Amortization of acquired in place leases	$ 8,100	$ 11,400	$ 14,400