Organization and Summary of Significant Accounting Policies (Gross Intangible Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Intangible lease liabilities (included in Other liabilities):
Below-market in-place leases	$ 41,988	$ 44,468
Less: accumulated amortization	(25,306)	(26,055)
Below-market in-place leases, net	16,682	18,413
Above-market in-place leases, net
Intangible lease assets (included in Other assets):
Leases	15,297	16,583
Less: accumulated amortization	(9,081)	(9,299)
Leases, net	6,216	7,284
In-place leases, net
Intangible lease assets (included in Other assets):
Leases	104,310	104,592
Less: accumulated amortization	(60,095)	(61,004)
Leases, net	$ 44,215	$ 43,588