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Common and Preferred Stock	12 Months Ended
Common and Preferred Stock	Dec. 31, 2018
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 2018, the Company repurchased a total of 1.3 million shares at a cost of $173.9 million, compared to 0.3 million shares purchased at a cost of $29.1 million in 2017. As of December 31, 2018, the amount of share repurchase authorization remaining was $377 million. At December 31, 2018 and 2017, 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 outstanding at December 31, 2018 and 2017.