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Dispositions
3 Months Ended
Mar. 31, 2016
Business Combinations [Abstract]  
Dispositions
Dispositions

Dispositions of buildings (see Note 10 for the number of buildings sold as well as for their classification between continuing and discontinued operations) and undeveloped land generated net cash proceeds of $57.4 million and $109.9 million during the three months ended March 31, 2016 and 2015, respectively.