CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net income	$ 1,087,060	$ 832,105
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and intangibles	158,917	151,873
Amortization of debt discount and issuance costs	2,207	2,152
Deferred income taxes	21,922	14,987
Share-based compensation programs	12,575	11,480
Other	1,382	1,906
Changes in operating assets and liabilities:
Accounts receivable	(45,359)	(34,966)
Inventory	6,357	(78,086)
Accounts payable	398,785	334,503
Income taxes payable	12,408	210,855
Other	56,578	112,269
Net cash provided by operating activities	1,712,832	1,559,078
Investing activities:
Purchases of property and equipment	(222,607)	(244,471)
Proceeds from sale of property and equipment	4,566	4,846
Investment in tax credit equity investments	(1,768)	(95,292)
Other	(1,083)	(311)
Net cash used in investing activities	(220,892)	(335,228)
Financing activities:
Proceeds from borrowings on revolving credit facility	0	1,162,000
Payments on revolving credit facility	0	(1,423,000)
Proceeds from the issuance of long-term debt	0	499,795
Principal payments on long-term debt	(300,000)	0
Payment of debt issuance costs	(3,299)	(3,840)
Repurchases of common stock	(1,064,189)	(651,027)
Net proceeds from issuance of common stock	41,921	25,593
Other	(313)	(253)
Net cash used in financing activities	(1,325,880)	(390,732)
Effect of exchange rate changes on cash	(82)	(1,101)
Net increase in cash and cash equivalents	165,978	832,017
Cash and cash equivalents at beginning of the period	465,640	40,406
Cash and cash equivalents at end of the period	631,618	872,423
Supplemental disclosures of cash flow information:
Income taxes paid	292,673	20,187
Interest paid, net of capitalized interest	$ 76,788	$ 73,091