Mortgage Notes Payable, Credit Facilities and Senior Notes - Mortgage Notes Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Long-term debt	$ 106,320	$ 70,683
Mortgage premiums	1,921	1,037
Net unamortized deferred financing costs	(326)	(417)
Total mortgage notes payable	$ 107,915	71,303
Bernardo Heights Plaza
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.70%
Long-term debt	$ 0	8,216
Santa Teresa Village
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	6.20%
Long-term debt	$ 10,138	10,383
Magnolia Shopping Center
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.50%
Long-term debt	$ 8,951	9,135
Casitas Plaza Shopping Center
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.32%
Long-term debt	$ 7,307	7,449
Riverstone Marketplace
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	4.96%
Long-term debt	$ 18,424	0
Fullerton Crossroads
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	4.728%
Long-term debt	$ 26,000	0
Diamond Hills Plaza
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	3.55%
Long-term debt	$ 35,500	$ 35,500