Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Assets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Assets [Line Items]
Acquired lease intangible assets, net	$ 82,778	$ 79,205
Acquired Lease Intangible Assets
Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Assets [Line Items]
2018	14,085
2019	10,270
2020	8,312
2021	6,554
2022	5,523
Thereafter	38,034
Acquired lease intangible assets, net	$ 82,778