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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net earnings $ 404,457 $ 375,759
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation of property and equipment 60,500 53,476
Gain on sale of property and equipment (659) (722)
Bad debt expense 6,768 8,429
Deferred income taxes 2,822 1,414
Stock-based compensation 4,641 4,620
Excess tax benefits from stock-based compensation (1,756) (1,925)
Amortization of non-compete agreements 395 395
Changes in operating assets and liabilities:    
Trade accounts receivable (88,420) (116,363)
Inventories (24,623) (52,311)
Other current assets (1,984) (19,346)
Accounts payable 28,070 21,326
Accrued expenses 20,789 33,564
Income taxes (8,525) 34,975
Other (490) (10,349)
Net cash provided by operating activities 401,985 332,942
Cash flows from investing activities:    
Purchases of property and equipment (119,462) (143,547)
Proceeds from sale of property and equipment 6,696 4,154
Net decrease in marketable securities 0 451
Net increase in other assets (82) (23)
Net cash used in investing activities (112,848) (138,965)
Cash flows from financing activities:    
Borrowings under line of credit 965,000 540,000
Payments against line of credit (740,000) (435,000)
Proceeds from exercise of stock options 9,289 7,036
Excess tax benefits from stock-based compensation 1,756 1,925
Purchases of common stock (273,490) (26,697)
Payments of dividends (245,983) (222,546)
Net cash used in financing activities (283,428) (135,282)
Effect of exchange rate changes on cash and cash equivalents (8,430) (872)
Net (decrease) increase in cash and cash equivalents (2,721) 57,823
Cash and cash equivalents at beginning of period 114,496 58,506
Cash and cash equivalents at end of period 111,775 116,329
Supplemental disclosure of cash flow information:    
Cash paid during each period for interest 2,096 591
Net cash paid during each period for income taxes $ 248,473 $ 175,453