Related Party Transactions (Details) (USD $)	12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 15, 2008 Del Monte Center	Dec. 31, 2013 ICW Plaza	Dec. 31, 2012 ICW Plaza	Dec. 31, 2011 ICW Plaza	May 31, 2011 ICW Plaza sqft	Dec. 31, 2013 Valencia Corporate Center	Dec. 31, 2012 Valencia Corporate Center	Dec. 31, 2011 Valencia Corporate Center	Dec. 31, 2013 WBW CHP LLC	Dec. 31, 2012 WBW CHP LLC	Dec. 31, 2011 WBW CHP LLC	Dec. 31, 2013 Management and supervision of tenant improvements For projects where the Company directly supervised construction subcontractors	Dec. 31, 2013 Management and supervision of tenant improvements For projects where the Company managed a general contractor	Dec. 31, 2013 Minimum	Dec. 31, 2013 Minimum Management and supervision of buildings and improvements	Dec. 31, 2013 Maximum	Dec. 31, 2013 Maximum Management and supervision of buildings and improvements
Related Party Transaction [Line Items]
Property management fees, percentage of gross monthly cash collections																	1.25%		5.50%
Property management fees, minimum monthly fees																	$ 2,500		$ 5,000
Construction management fees, percentage of construction and development costs															10.00%	3.00%		3.00%		5.00%
Acquisition and Disposition Fees, percentage of value of all acquisitions or dispositions																	0.50%		1.00%
Leasing fees, percentage of value of all leases executed	1.00%
Asset management fees, hourly rates																	40		125
Financing Fees as a percentage of financed amount																	0.25%		0.50%
Financing fees, flat fee	50,000
Unsecured loans				12,000,000
Percentage interest on notes payable to affiliates				10.00%
Total rental income	242,757,000	225,249,000	194,168,000		2,200,000	2,100,000	2,300,000		0	0	1,200,000
Square footage of property								12,000
Investment in WBW CHP LLC, in percentage	47.70%
Recovered reimbursements of operating expenses of WBW CHP LLC												$ 1,100,000	$ 1,000,000	$ 1,000,000