Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 74,650	$ 69,022
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation, amortization and accretion	19,895	8,836
Recovery of doubtful accounts, net	(825)	(719)
Write-down of inventory	5,831	1,627
Stock compensation	10,894	10,212
Other	1,232	(741)
Changes in operating assets and liabilities, net of assets and liabilities acquired in the acquisition of businesses:
Trade accounts receivable	(97,378)	(65,086)
Inventories	(230,164)	(112,587)
Prepaid expenses and other current assets	(42,068)	(611)
Other assets	(3,888)	(444)
Trade accounts payable	59,530	25,872
Accrued expenses	(8,743)	(3,952)
Income taxes payable	(13,581)	4,822
Long-term liabilities	2,357	1,823
Net cash used in operating activities	(222,258)	(61,926)
Cash flows from investing activities:
Proceeds from sales of short-term investments		26,080
Purchases of property and equipment	(21,483)	(14,496)
Acquisition of businesses and equity method investment	(126,615)	(5,191)
Purchases of intangible assets	(4,224)
Net cash (used in) provided by investing activities	(152,322)	6,393
Cash flows from financing activities:
Cash paid for shares withheld for taxes	(17,043)	(1,972)
Excess tax benefits from stock compensation	10,995	2,066
Cash received from issuances of common stock	19	86
Cash paid for repurchases of common stock	(19,918)	(10,082)
Short-term borrowings	45,000
Net cash provided by (used in) financing activities	19,053	(9,902)
Effect of exchange rates on cash	726	109
Net change in cash and cash equivalents	(354,801)	(65,326)
Cash and cash equivalents at beginning of period	445,226	315,862
Cash and cash equivalents at end of period	90,425	250,536
Cash paid during the period for:
Income taxes	36,096	33,380
Interest	14	25
Non-cash investing activity:
Accruals for purchases of property and equipment	995	461
Contingent consideration arrangement for acquisition of business	84,300
Accruals for asset retirement obligations	63
Non-cash financing activity:
Accruals for shares withheld for taxes	$ 2,613	$ 593