Mortgage Notes Payable, Credit Facilities and Senior Notes - Mortgage Notes Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Total mortgage notes payable	$ 88,511	$ 107,915
Notes Payable, Other Payables [Member]
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Long-term debt	86,708	106,320
Mortgage premiums	2,074	1,921
Net unamortized deferred financing costs	(271)	(326)
Total mortgage notes payable	$ 88,511	107,915
Notes Payable, Other Payables [Member] | Santa Teresa Village
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	6.20%
Long-term debt	$ 0	10,138
Notes Payable, Other Payables [Member] | Magnolia Shopping Center
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.50%
Long-term debt	$ 0	8,951
Notes Payable, Other Payables [Member] | Casitas Plaza Shopping Center
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.32%
Long-term debt	$ 7,158	7,307
Notes Payable, Other Payables [Member] | Riverstone Marketplace
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	4.96%
Long-term debt	$ 18,050	18,424
Notes Payable, Other Payables [Member] | Fullerton Crossroads
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	4.728%
Long-term debt	$ 26,000	26,000
Notes Payable, Other Payables [Member] | 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