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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Share Repurchase Authorization On October 17, 2016, our Board of Directors authorized the repurchase by us of up to an additional $300 million of our issued and outstanding common stock by various means from time to time through and including December 31, 2021. This authorization is in addition to approximately $98.8 million that remains available to us for the repurchase of our common stock pursuant to a previous authorization in 2014. Accordingly, at October 17, 2016, we had approximately $398.8 million remaining pursuant to such authorizations for the repurchase of our common stock. Tender Offer On October 17, 2016, we commenced a "modified Dutch auction" tender offer, or the Tender Offer, to purchase up to 5,494,505 shares of our common stock at a price per share of not less than $45.50 and not greater than $52.25, for an aggregate purchase price of up to $250.0 million. The Tender Offer will expire, unless extended by us, at 5:00 pm Eastern Time on November 15, 2016. We expect to fund the purchase of shares tendered in the Tender Offer from available cash on hand and revolving loan borrowings under the Credit Agreement.