Acquired In-Place Leases and Above/Below Market Leases Amortization for Acquired In-Place Leases During Next Five Years and Thereafter Assuming No Early Lease Terminations (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
2018	$ 3,656
2019	3,561
2020	2,997
2021	2,555
2022	2,242
Thereafter	15,171
Acquired lease intangible liabilities, net	30,182	$ 33,448
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
2018	2,060
2019	1,618
2020	1,075
2021	724
2022	637
Thereafter	2,257
Acquired lease intangible assets, net	8,371
Above market leases
Acquired Finite-Lived Intangible Assets [Line Items]
2018	631
2019	322
2020	103
2021	28
2022	28
Thereafter	66
Acquired lease intangible assets, net	$ 1,178