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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net earnings $ 499,478 $ 516,361 $ 494,150
Adjustments to reconcile net earnings to net cash provided by operating activities, net of acquisitions:      
Depreciation of property and equipment 103,525 86,071 72,145
Gain on sale of property and equipment (532) (1,411) (964)
Bad debt expense 8,550 8,769 11,480
Deferred income taxes 25,571 8,290 1,760
Stock-based compensation 4,100 5,841 7,039
Excess tax benefits from stock-based compensation (5,884) (3,390) (2,094)
Amortization of non-compete agreements 527 527 527
Changes in operating assets and liabilities, net of acquisitions:      
Trade accounts receivable (40,490) (20,608) (63,418)
Inventories (80,853) (47,830) (87,622)
Other current assets 29,138 (15,778) (7,510)
Accounts payable (17,233) 20,617 12,501
Accrued expenses (28,721) 11,141 25,263
Income taxes 15,535 (26,610) 34,405
Other 1,288 4,950 1,730
Net cash provided by operating activities 513,999 546,940 499,392
Cash flows from investing activities:      
Purchases of property and equipment (189,451) (155,168) (189,474)
Cash paid for acquisitions 0 (23,493) (5,575)
Proceeds from sale of property and equipment 6,505 9,941 5,819
Net decrease in marketable securities 0 0 451
Other (5,147) (11,907) (2)
Net cash used in investing activities (188,093) (180,627) (188,781)
Cash flows from financing activities:      
Borrowings under debt obligations 950,000 1,215,000 705,000
Payments against debt obligations (920,000) (955,000) (615,000)
Proceeds from exercise of stock options 29,272 19,099 7,697
Excess tax benefits from stock-based compensation 5,884 3,390 2,094
Purchases of common stock (59,440) (292,951) (52,942)
Payments of dividends (346,588) (327,101) (296,581)
Net cash used in financing activities (340,872) (337,563) (249,732)
Effect of exchange rate changes on cash and cash equivalents (1,318) (14,227) (4,889)
Net (decrease) increase in cash and cash equivalents (16,284) 14,523 55,990
Cash and cash equivalents at beginning of year 129,019 114,496 58,506
Cash and cash equivalents at end of year 112,735 129,019 114,496
Supplemental disclosure of cash flow information:      
Cash paid for interest 6,183 3,103 915
Net cash paid for income taxes $ 248,329 $ 327,034 $ 257,514