Real Estate Investments Acquisitions and Dispositions (Details) (USD $)	3 Months Ended			0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 27, 2014 Rob Roy - Land [Member] acre	Feb. 19, 2014 Encino Trace - Land [Member] Properties sqft Storey acre	Mar. 31, 2014 Encino Trace - Building I [Member]
Significant Acquisitions and Disposals [Line Items]
Area Owned by Company of Undeveloped Parcels Of Land					54.1
Total potential development capacity					320,000
Number of Real Estate Properties					2
Number of floors of a building					4
Area of Land				16.8
Business Combination, Consideration Transferred					$ 14,000,000
Construction in Progress, Gross					8,400,000
Land	680,695,000		680,513,000		4,600,000
Escrow Deposit					1,000,000
Construction-in-progress	90,140,000		74,174,000			14,600,000
Land Sales				3,500,000
Gain on sale of undepreciated real estate	$ 1,187,000	$ 0		$ 1,200,000