Acquired Intangible Assets and Liabilities (Schedule of Estimated Annual Amortization of Below Market Leases) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Total	$ 78,641	$ 81,899
Below-Market Leases, Net of Above-Market Leases
Finite-Lived Intangible Assets [Line Items]
Remainder of 2017	5,179
2018	5,538
2019	5,680
2020	7,434
2021	7,423
Thereafter	26,561
Total	$ 57,815