Organization and Summary of Significant Accounting Policies (Gross Intangible Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Intangible lease liabilities (included in Other liabilities):
Below-market in-place leases	$ 44,552	$ 44,468
Less: accumulated amortization	(25,990)	(26,055)
Below-market in-place leases, net	18,562	18,413
Above market in-place leases, net
Intangible lease assets (included in Other assets):
Leases	16,467	16,583
Less: accumulated amortization	(9,601)	(9,299)
Leases, net	6,866	7,284
In-place leases, net
Intangible lease assets (included in Other assets):
Leases	106,831	104,592
Less: accumulated amortization	(63,497)	(61,004)
Leases, net	$ 43,334	$ 43,588