Organization and Summary of Significant Accounting Policies (Gross Intangible Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Intangible lease liabilities (included in Other liabilities):
Below-market in-place leases	$ 41,912	$ 44,468
Less: accumulated amortization	(25,151)	(26,055)
Below-market in-place leases, net	16,761	18,413
Above-market in-place leases, net
Intangible lease assets (included in Other assets):
Leases	15,329	16,583
Less: accumulated amortization	(9,197)	(9,299)
Leases, net	6,132	7,284
In-place leases, net
Intangible lease assets (included in Other assets):
Leases	101,887	104,592
Less: accumulated amortization	(60,070)	(61,004)
Leases, net	$ 41,817	$ 43,588