Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 217,364	$ 192,757
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	37,922	36,476
Amortization of debt costs	1,887	1,811
Increase in provision for inventory losses	13,315	8,902
Increase in receivables	(24,343)	(23,273)
Increase in inventory	(65,270)	(78,193)
Decrease in prepaids and other current assets	4,217	4,568
Increase (decrease) in accounts payable	36,091	(7,855)
(Decrease) increase in deferred revenue and other current liabilities	(14,254)	8,721
Other operating activities	8,455	(1,962)
Net cash provided by operating activities	215,384	141,952
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(33,631)	(29,856)
Other investing activities	(1,101)	(1,966)
Net cash used in investing activities	(34,732)	(31,822)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid to shareholders	(43,309)	(34,300)
Payments on long-term debt	(2,850)	(1,757)
Proceeds from exercised stock options	10,282	23,840
Tax benefit from exercise of stock options	12,195	35,605
Repurchase of treasury stock	(238,406)	(359,990)
Proceeds from issuance of long-term debt		199,000
Deferred financing fees		(1,148)
Other financing activities		(2,500)
Net cash used in financing activities	(262,088)	(141,250)
Effect of exchange rate on cash and cash equivalents	573	(523)
Net decrease in cash and cash equivalents	(80,863)	(31,643)
Beginning balance, cash and cash equivalents	158,541	128,438
Ending balance, cash and cash equivalents	$ 77,678	$ 96,795