Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 30,957	$ 74,650
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation, amortization and accretion	22,899	19,895
Change in fair value of contingent consideration	6,223
Provision for (recovery of) doubtful accounts, net	1,717	(825)
Write-down of inventory	3,210	5,831
Stock compensation	12,029	10,894
Other	857	1,232
Changes in operating assets and liabilities net of assets and liabilities acquired in acquisition of businesses:
Trade accounts receivable	(47,601)	(97,378)
Inventories	(236,107)	(230,164)
Prepaid expenses and other current assets	24,486	(42,068)
Income tax receivable	(16,838)
Other assets	(3,142)	(3,888)
Trade accounts payable	53,433	59,530
Contingent consideration	(959)
Accrued expenses	(23,623)	(8,743)
Income taxes payable	(13,351)	(13,581)
Long-term liabilities	2,425	2,357
Net cash used in operating activities	(183,385)	(222,258)
Cash flows from investing activities:
Purchases of property and equipment	(42,002)	(21,483)
Acquisition of businesses	(8,329)	(126,615)
Equity method investment	(500)
Purchases of intangible assets	(3,985)	(4,224)
Net cash used in investing activities	(54,816)	(152,322)
Cash flows from financing activities:
Cash paid for shares withheld for taxes	(5,750)	(17,024)
Excess tax benefits from stock compensation	2,108	10,995
Cash paid for repurchases of common stock	(184,695)	(19,918)
Proceeds from issuance of short-term borrowings	275,000	45,000
Financing costs on short-term borrowings	(1,714)
Contingent consideration paid	(29,041)
Cash paid for noncontrolling interest in consolidated entity	(20,000)
Net cash provided by financing activities	35,908	19,053
Effect of exchange rates on cash	323	726
Net change in cash and cash equivalents	(201,970)	(354,801)
Cash and cash equivalents at beginning of period	263,606	445,226
Cash and cash equivalents at end of period	61,636	90,425
Cash paid during the period for:
Income taxes	39,786	36,096
Interest	453	14
Non-cash investing activity:
Accruals for purchases of property and equipment	2,355	995
Contingent consideration arrangement for acquisition of businesses	1,120	84,300
Deferred purchase payments for acquisition of business	3,671
Accruals for asset retirement obligations	146	63
Non-cash financing activity:
Accruals for shares withheld for taxes	$ 752	$ 2,613