Subsequent Events (Details) (USD $)	0 Months Ended
	Jan. 30, 2015	Jan. 08, 2015
River Place [Member]
Subsequent Event [Line Items]
Proceeds from Collection of Notes Receivable	$ 88,000,000
1000 Atrium Way and Libertyview [Member] [Member]
Subsequent Event [Line Items]
Number of Real Estate Properties		2
Sale Consideration Of Sold Property		28,300,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		$ 9,000,000
1000 Atrium Way [Member]
Subsequent Event [Line Items]
Net Rentable Space Sold		99,668
Libertyview [Member]
Subsequent Event [Line Items]
Net Rentable Space Sold		121,737