Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 144,331	$ 130,528
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	25,131	24,329
Amortization of debt costs	1,258	1,166
Increase in provision for inventory losses	8,990	6,554
Increase in receivables	(13,948)	(15,049)
Increase in inventory	(61,874)	(90,642)
(Increase) decrease in prepaids and other current assets	(1,997)	1,699
Increase in accounts payable	32,449	34,475
(Decrease) increase in deferred revenue and other current liabilities	(13,250)	1,384
Other operating activities	5,742	(1,578)
Net cash provided by operating activities	126,832	92,866
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(21,475)	(20,838)
Other investing activities	(1,194)	(1,895)
Net cash used in investing activities	(22,669)	(22,733)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid to shareholders	(29,078)	(23,409)
Payments on long-term debt	(1,893)	(833)
Proceeds from exercised stock options	6,280	19,540
Tax benefit from exercise of stock options	6,970	28,903
Repurchase of treasury stock	(181,310)	(59,960)
Other financing activities		(2,500)
Net cash used in financing activities	(199,031)	(38,259)
Effect of exchange rate on cash and cash equivalents	352	(145)
Net (decrease) increase in cash and cash equivalents	(94,516)	31,729
Beginning balance, cash and cash equivalents	158,541	128,438
Ending balance, cash and cash equivalents	$ 64,025	$ 160,167