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Share repurchases	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Share repurchases	Share repurchases During the six months ended June 30, 2018, the Company repurchased a total of 11,995 shares of its common stock for $809,900 at an average price of $67.52 per share. The Company also repurchased 3,872 shares of its common stock for $272,902 at an average price of $70.48 per share, subsequent to June 30, 2018 through July 31, 2018. On July 11, 2018, the Company's Board of Directors approved an additional share repurchase authorization in the amount of $1,389,999. This share repurchase authorization was in addition to the $110,001 remaining at that time under the Company’s Board of Directors’ prior share repurchase authorization approved in October 2017. Accordingly, as of July 31, 2018, the Company has a total of $1,426,313 remaining 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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