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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Net income $ 657,979 $ 547,755
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of property, equipment and intangibles 130,792 114,959
Amortization of debt discount and issuance costs 1,649 1,344
Deferred income taxes 9,024 8,049
Share-based compensation programs 10,152 10,353
Other 4,653 6,037
Changes in operating assets and liabilities:    
Accounts receivable (29,550) (10,797)
Inventory (81,614) (179,866)
Accounts payable 124,642 155,124
Income taxes payable 26,439 58,173
Other 21,067 (624)
Net cash provided by operating activities 875,233 710,507
Investing activities:    
Purchases of property and equipment (224,117) (227,506)
Proceeds from sale of property and equipment 2,936 752
Other (424) (1,967)
Net cash used in investing activities (221,605) (228,721)
Financing activities:    
Proceeds from borrowings on revolving credit facility 1,429,000 1,782,000
Payments on revolving credit facility (1,650,000) (1,066,000)
Proceeds from issuance of long-term debt 498,660 0
Payments of debt issuance costs (3,923) (1,827)
Repurchases of common stock (965,867) (1,342,591)
Net proceeds from issuance of common stock 31,178 26,718
Other (2,156) (156)
Net cash used in financing activities (663,108) (601,856)
Net decrease in cash and cash equivalents (9,480) (120,070)
Cash and cash equivalents at beginning of the period 46,348 [1] 146,598
Cash and cash equivalents at end of the period 36,868 26,528
Supplemental disclosures of cash flow information:    
Income taxes paid 150,990 203,780
Interest paid, net of capitalized interest $ 55,556 $ 37,151
[1] The balance sheet at December 31, 2017, 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.