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Share Repurchases Share Repurchases (Notes)	6 Months Ended
	Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items]
Treasury Stock [Text Block]	Share repurchases During the six months ended June 30, 2017, the Company repurchased a total of 3,575 shares of its common stock for $231,674 or an average price of $64.81 per share. On July 13, 2016, the Company’s Board of Directors approved a share repurchase authorization in the amount of $1,240,748. This share repurchase authorization was in addition to the $259,252 remaining at that time under the Company’s Board of Directors’ prior share repurchase authorization announced in April 2015. As of June 30, 2017, there was $445,430 available under the current Board 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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