Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015
Operating activities:
Net income	$ 791,661		$ 712,640
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and intangibles	161,447		158,065
Amortization of debt discount and issuance costs	1,811		1,578
Excess tax benefit from share-based compensation	(46,034)		(50,759)
Deferred income taxes	4,439		(22,780)
Share-based compensation programs	14,371		16,656
Other	4,174		4,194
Changes in operating assets and liabilities:
Accounts receivable	(35,312)		(24,511)
Inventory	(158,877)		(52,024)
Accounts payable	390,849		208,959
Income taxes payable	39,636		85,428
Other	(147)		25,276
Net cash provided by operating activities	1,168,018		1,062,722
Investing activities:
Purchases of property and equipment	(356,234)		(296,474)
Proceeds from sale of property and equipment	2,489		2,197
Payments received on notes receivable	1,047		3,028
Net cash used in investing activities	(352,698)		(291,249)
Financing activities:
Proceeds from the issuance of long-term debt	499,160		0
Payments of debt issuance costs	(4,125)		0
Principal payments on capital leases	0		(25)
Repurchases of common stock	(959,789)		(849,202)
Excess tax benefit from share-based compensation	46,034		50,759
Net proceeds from issuance of common stock	47,419		53,351
Net cash used in financing activities	(371,301)		(745,117)
Net increase in cash and cash equivalents	444,019		26,356
Cash and cash equivalents at beginning of the period	116,301	[1]	250,560
Cash and cash equivalents at end of the period	560,320		276,916
Supplemental disclosures of cash flow information:
Income taxes paid	416,901		342,920
Interest paid, net of capitalized interest	$ 59,547		$ 51,003

[1] The balance sheet at December 31, 2015, has been derived from the audited consolidated financial statements at that date, but does not include all of the information and footnotes required by United States generally accepted accounting principles for complete financial statements.