Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Liabilities - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Liabilities [Line Items]
Acquired lease intangible liabilities, net	$ 178,984	$ 154,958
Acquired Lease Intangible Liabilities
Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Liabilities [Line Items]
2018	15,297
2019	14,334
2020	13,275
2021	12,064
2022	11,045
Thereafter	112,969
Acquired lease intangible liabilities, net	$ 178,984