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Shareholders' Equity	6 Months Ended
	Jun. 30, 2017
Shareholders’ Equity [Abstract]
Shareholders' Equity	4. Shareholders’ Equity On May 23, 2017, we announced that our Board of Directors authorized the expenditure of up to an additional $100,000 to repurchase shares of common stock, bringing the aggregate authorized expenditures for stock repurchases up to $2.3 billion.  Under the remaining repurchase authorizations, shares may be purchased from time to time in open market transactions, subject to market conditions. During the six months ended June 30, 2017,  we repurchased 244 shares of common stock under authorized programs, for a total cost of $104,648. The cumulative shares repurchased under authorized programs as of June 30, 2017, were 7,107 for a total cost of $2,102,457. As of June 30, 2017, $197,927 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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