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Common Stock	9 Months Ended
	Sep. 30, 2018
Stockholders' Equity Note [Abstract]
Common Stock	Common Stock         As of September 30, 2018 and December 31, 2017, there were 57,751,630 and 58,798,428 shares of our common stock outstanding, respectively. During the three months ended September 30, 2018 and 2017, we issued 47,125 and 19,679 shares of common stock, respectively. During the nine months ended September 30, 2018 and 2017, we issued 218,055 and 213,060 shares of common stock, respectively. These shares were issued primarily upon: (a) the satisfaction of required conditions under certain of our share-based compensation plans, (b) the purchase of common stock pursuant to our employee stock purchase plan and (c) the exercise of stock options. On September 26, 2011, our Board of Directors authorized us to repurchase up to $100.0 million of our outstanding common stock. On December 5, 2013, October 23, 2014, October 28, 2015 and October 25, 2017, our Board of Directors authorized us to repurchase up to an additional $100.0 million, $250.0 million, $200.0 million and $100.0 million of our outstanding common stock, respectively. During 2018, we have repurchased 1,264,853 shares of our common stock for approximately $95.6 million. Since the inception of the repurchase programs through September 30, 2018, we have repurchased approximately 14.1 million shares of our common stock for approximately $670.9 million. As of September 30, 2018, there remained authorization for us to repurchase approximately $79.1 million of our shares. Subsequent to September 30, 2018, our Board of Directors authorized us to repurchase up to an additional $200.0 million of our outstanding common stock. The repurchase programs have no expiration date and do not obligate the Company to acquire any particular amount of common stock and may be suspended, recommenced or discontinued at any time or from time to time without prior notice. We may repurchase our shares from time to time to the extent permitted by securities laws and other legal requirements, including provisions in our 2016 Credit Agreement, placing limitations on such repurchases. The repurchase programs have been and will be funded from our operations.

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The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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