Subsequent Events (Details) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended		9 Months Ended	1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Oct. 07, 2013 Subsequent Event Carmel Crossing sqft	Oct. 31, 2013 Subsequent Event Lakewood II sqft	Oct. 31, 2013 Parent Subsequent Event Lakewood II	Sep. 30, 2013 Restricted Stock Units (RSUs)	Oct. 25, 2013 Restricted Stock Units (RSUs) Chief Financial Officer	Oct. 25, 2013 Restricted Stock Units (RSUs) Chief Operating Officer	Oct. 25, 2013 Restricted Stock Units (RSUs) Executive Vice President
Subsequent Event [Line Items]
Area of real estate property held for sale (in sqf)					326,000	123,000
Gross sales price of assets under agreement to sell					$ 37,500,000	$ 10,600,000
Number of units granted (in shares)			0					274,000	94,335	47,167	26,360
Gain on sale of real estate from discontinued operations	11,545,000	995,000	12,087,000	9,767,000		5,900,000	1,800,000
Proceeds from sale of property						$ 3,100,000