Acquired Lease Intangibles (Details) - Intangible Assets and Liabilities - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Acquired lease intangible assets	$ 72,109	$ 82,778
Acquired lease intangible assets, net	72,109	82,778
Liabilities:
Below-market leases	217,212	222,929
Accumulated amortization	(51,066)	(43,945)
Acquired lease intangible liabilities, net	166,146	178,984
In-place leases
Assets:
Acquired lease intangible assets	92,354	99,924
Accumulated amortization	(36,835)	(36,971)
Above-market leases
Assets:
Acquired lease intangible assets	30,093	33,176
Accumulated amortization	$ (13,503)	$ (13,351)