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Share repurchases	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Share repurchases	Share repurchases During the three months ended March 31, 2018, the Company repurchased a total of 4,197 shares of its common stock for $298,377 at an average price of $71.09 per share. The Company also repurchased 4,350 shares of its common stock for $275,992 at an average price of $63.44 per share, subsequent to March 31, 2018 through May 2, 2018. On October 10, 2017, the Company's Board of Directors approved an additional share repurchase authorization in the amount of $1,252,961. This share repurchase authorization was in addition to the $247,039 remaining at that time under the Company’s Board of Directors’ prior share repurchase authorization announced in July 2016. Accordingly, as of May 2, 2018, the Company has a total of $544,747 available under the current Board repurchase authorizations for additional share repurchases. Although these share repurchase authorizations do not have expiration dates, the Company remains subject to share repurchase limitations under the terms of its senior secured credit facilities and the indentures governing its senior notes.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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