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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2016
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Events On October 3, 2016, the Company completed the sale of 108 properties totaling approximately 7.6 million square feet and 26.7 acres of land for $969 million. See Note 5: Real Estate for further details on this sale. The Company gave notice on October 5, 2016 of its intention to redeem on November 4, 2016 its 6.625% senior notes due October 2017 in the amount of $296.5 million and its 7.5% medium term notes due January 2018 in the amount of $100.0 million. The Company currently expects to incur debt extinguishment losses of approximately $23.3 million in the fourth quarter of 2016 as a result of these prepayments.