Organization and Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($) segment	Dec. 31, 2013 USD ($) segment
Debt Instrument [Line Items]
Number of segments | segment	1	1	1
Interest costs capitalized	$ 2,383,000	$ 1,629,000	$ 1,369,000
Revolving credit facility borrowing capacity	650,000,000
Accumulated amortization	9,877,000	8,514,000
Additional tax expense	9,607,000
Mortgages
Debt Instrument [Line Items]
Deferred costs	226,000	226,000
Accumulated amortization	93,000	69,000
Loans Payable
Debt Instrument [Line Items]
Deferred costs	17,782,000	16,775,000
Accumulated amortization	$ 4,704,000	$ 5,769,000