Acquired Intangible Assets And Liabilities (Schedule of Estimated Annual Amortization of Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Acquired in-place lease value
Finite-Lived Intangible Assets [Line Items]
Remainder of 2018	$ 98,083
2019	147,579
2020	111,714
2021	87,152
2022	65,258
Thereafter	245,030
Net	754,816	$ 859,567
Tenant relationships
Finite-Lived Intangible Assets [Line Items]
Remainder of 2018	61,693
2019	123,386
2020	123,386
2021	123,386
2022	123,386
Thereafter	1,185,567
Net	$ 1,740,804