Organization and Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($) segment
Debt Instrument [Line Items]
Number of segments | segment	1	1	1
Interest costs capitalized	$ 1,738,000	$ 2,383,000	$ 1,629,000
Restricted cash and cash held in escrow	0	601,000
Revolving credit facility borrowing capacity	650,000,000
Accumulated amortization	11,268,000	9,877,000
Additional tax expense		9,607,000
Mortgages
Debt Instrument [Line Items]
Deferred costs	147,000	226,000
Accumulated amortization	$ 38,000	93,000
Loans Payable
Debt Instrument [Line Items]
Deferred costs		21,157,000	17,782,000
Accumulated amortization		$ 6,376,000	$ 4,704,000