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Share repurchases	9 Months Ended
Share repurchases	Sep. 30, 2018
Equity [Abstract]
Share repurchases	Share repurchases During the nine months ended September 30, 2018, the Company repurchased a total of 16,844 shares of its common stock for $1,153,511 at an average price of $68.48 per share. The Company has not repurchased any shares of its common stock subsequent to September 30, 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 November 5, 2018, the Company has a total of $1,355,605 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.