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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2014
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 1, 2014, we received $4.7 million in cash in connection with the second quarter redemption of our former investment in Board of Trade. On July 1, 2014, we prepaid the remaining $36.9 million balance on a secured mortgage loan with an effective interest rate of 3.34% that was originally scheduled to mature in April 2015. We expect to record $0.3 million of loss on debt extinguishment related to this prepayment. On July 29, 2014, we sold five office properties and a land parcel in a single transaction in Raleigh, NC for a sale price of $58.7 million and expect to record a gain on disposition of property of $11.7 million.