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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 16, 2016, we redeemed at par $139.1 million of our 6.25% senior unsecured notes due 2016. On February 16, 2016, we sold Executive Park (9 buildings), with 427,443 square feet for $50.9 million. From January 1, 2016 through February 16, 2016, share buyback activity has totaled 861,162 common shares at a weighted average price of $25.94 per share.