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Shareholders' Equity	9 Months Ended
	Sep. 30, 2017
Shareholders’ Equity [Abstract]
Shareholders' Equity	5. Shareholders’ Equity Through September 30, 2017, we had announced authorizations by our Board of Directors of repurchases of shares of common stock, which in the aggregate authorized expenditures of up to $2.3 billion. On October 24, 2017, we announced that our Board of Directors authorized the expenditure of an additional $100,000 to repurchase shares of common stock.  Under the remaining repurchase authorizations, shares may be purchased from time to time in open market transactions, subject to market conditions. During the nine months ended September 30, 2017, we repurchased 545 shares of common stock under authorized programs, for a total cost of $207,159. The cumulative shares repurchased under authorized programs as of September 30, 2017, were 7,408 for a total cost of $2,204,968. As of September 30, 2017, $95,425 was available to repurchase shares under the announced repurchase authorizations. Shares repurchased are being held in treasury stock until such time as they are reissued or retired at the discretion of the Board of Directors.

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- Definition

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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