Organization and Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 segments	Dec. 31, 2011	Dec. 31, 2010	Oct. 31, 2012
Accounting Policies [Abstract]
Number of Business Segments, Prior	2
Number of segments	1
Interest costs capitalized	$ 1,540,000	$ 1,213,000	$ 617,000
Equity Method Investment Ownership Percentage Acquired			21.10%
Business Acquisition, Cost of Acquired Entity, Purchase Price			1,603,000
Line of Credit Facility, Maximum Borrowing Capacity				$ 500,000,000