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Subsequent Events Subsequent Events	3 Months Ended
Subsequent Events Subsequent Events	Mar. 31, 2018
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Events 2018 ATM Program On April 6, 2018, the Company established a new "at the market" stock offering program ("2018 ATM Program") through which it may issue and sell shares of its common stock having an aggregate gross sales price of up to $750 million. Sales under the 2018 ATM Program may be made by means of ordinary brokers' transactions on the NYSE or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or, subject to our specific instructions, at negotiated prices. The Company intends to use the net proceeds from any sales under the 2018 ATM Program for general corporate purposes, which may include the funding of future acquisitions or investments and the repayment or repurchase of any outstanding indebtedness. The Company has not sold any shares of common stock under the 2018 ATM Program.