Organization and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Interest costs capitalized	$ 416,000	$ 685,000	$ 1,243,000	$ 1,633,000
Restricted cash and cash held in escrow	0		0		$ 601,000
Revolving credit facility borrowing capacity	650,000,000		650,000,000
Mortgages [Member]
Debt Instrument [Line Items]
Debt costs	226,000		226,000		226,000
Debt costs accumulated amortization	112,000		112,000		93,000
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Debt costs	17,782,000		17,782,000		17,782,000
Debt costs accumulated amortization	$ 5,939,000		$ 5,939,000		$ 4,704,000