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Forward Equity and Equity Distribution Program	6 Months Ended
Forward Equity and Equity Distribution Program	Jun. 30, 2016
Forward Equity Sale Agreements
Forward Equity and Equity Distribution Program	Forward Equity and Equity Distribution Program In June 2016, the Company entered into an agreement to sell approximately 2.9 million shares of the Company’s common stock at a price of $167.25 per share (a “forward equity agreement”). The Company has the option to cash or net share settle all or a portion of the agreement in one or more transactions over the next twelve months. As of June 30, 2016, no portion of this forward equity agreement had been settled. Separately, the Company entered into equity distribution and forward equity agreements with several major securities firms under which the Company, from time to time, may issue and sell shares (immediately or on a forward basis) having an aggregate sales price of up to $500.0 million. These agreements replaced the Company’s previous forward equity program. As of June 30, 2016, no sales have occurred under these agreements.