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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2013
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events On July 31, 2013, the Company entered into a definitive agreement to acquire all of the outstanding partnership interests in the operating partnership of the Cabot Industrial Value Fund III (the "Fund") for a purchase price of $1.475 billion. The Fund owns 23 million square feet of industrial properties. The Company expects to finance the purchase price in part through the assumption of approximately $230 million in outstanding indebtedness and has received a commitment for a bridge loan of approximately $1.27 billion to finance the remainder of the purchase price, which it may replace with a combination of equity financing and permanent debt.