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Common and Preferred Stock	12 Months Ended
Common and Preferred Stock	Dec. 31, 2017
Equity [Abstract]
Common and Preferred Stock	Common and Preferred Stock On December 1, 2015 the Company’s Board of Directors approved a $300.0 million increase in the authorized level for repurchases of common stock. Repurchases under the program will be funded with future cash flow generation or borrowings available under the Revolving Facility. During 2017, the Company purchased a total of 0.3 million shares at a cost of $29.1 million, compared to 0.7 million shares purchased at a cost of $55.0 million in 2016. As of December 31, 2017, there was $551 million of repurchase authorization remaining. At December 31, 2017 and 2016, the Company had 150 million shares of authorized common stock, with a par value of $.01 per share, and five million shares of authorized preferred stock, with a par value of $.01 per share. No preferred stock was issued as of December 31, 2017 and 2016.