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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In October 2016, we sold one property (four buildings), with 151,917 square feet for $29.2 million, excluding closing costs. This property was classified as held for sale as of September 30, 2016 (see Note 3). In October 2016, we purchased a parcel of land adjacent to our Research Park property in Austin, Texas for $2.8 million. On November 1, 2016, we delivered notice of our intent to redeem at par our $250 million 6.25% senior unsecured notes due 2017 on December 15, 2016. The notes will be redeemed for cash at a price equal to 100% of the principal amount of the notes plus any accrued and unpaid interest up to, but excluding, the redemption date.