Acquired Intangible Assets and Liabilities (Schedule of Estimated Annual Amortization Of Below Market Leases) (Details) - Below-Market Leases, Net of Above Market Leases $ in Thousands	Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
2019	$ (15,323)
2020	(3,915)
2021	872
2022	7,898
2023	12,045
Thereafter	78,777
Total	$ 80,354