Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Net income	$ 616,757	$ 687,240	$ 705,672
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	167,691	147,487	141,675
Excess tax benefits from share-based compensation	(3,134)	(12,021)	(7,024)
Gain on sale of property, plant, and equipment	(3,989)	(15,237)	(3,189)
Deferred income taxes	65,990	33,226	35,544
Share-based compensation	16,892	19,719	17,717
Foreign exchange gain	(14,051)	0	0
Changes in operating assets and liabilities:
Trade accounts receivable, net	(19,273)	(53,544)	1,974
Merchandise inventories, net	(9,923)	(64,214)	(21,821)
Trade accounts payable	61,474	240,717	331,419
Other short-term assets and liabilities	(1,544)	37,271	967
Other long-term assets and liabilities	(61,847)	(74,566)	(43,561)
Changes in operating assets and liabilities	198,286	258,838	453,701
Net cash provided by operating activities	815,043	946,078	1,159,373
Investing activities
Purchases of property, plant and equipment	(156,760)	(160,643)	(109,544)
Proceeds from sale of property, plant, and equipment	21,275	28,811	8,618
Acquisition of businesses and other investing activities	(1,494,795)	(462,167)	(162,701)
Net cash used in investing activities	(1,630,280)	(593,999)	(263,627)
Financing activities
Proceeds from debt	6,630,294	4,350,000	3,862,224
Payments on debt	(4,350,222)	(4,100,000)	(4,005,191)
Payments on acquired debt	(833,775)	0	0
Share-based awards exercised, net of taxes paid	(5,239)	(16,147)	(9,572)
Excess tax benefits from share-based compensation	0	12,021	7,024
Dividends paid	(395,475)	(386,863)	(368,284)
Purchase of stock	(173,524)	(181,417)	(292,275)
Net cash provided by (used in) financing activities	872,059	(322,406)	(806,074)
Effect of exchange rate changes on cash	15,198	1,575	(15,771)
Net increase in cash and cash equivalents	72,020	31,248	73,901
Cash and cash equivalents at beginning of year	242,879	211,631	137,730
Cash and cash equivalents at end of year	314,899	242,879	211,631
Supplemental disclosures of cash flow information
Income taxes	298,827	374,865	352,153
Interest	$ 38,401	$ 19,043	$ 23,687