Condensed 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	$ 4,792	$ 30,957
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation, amortization and accretion	27,409	22,899
Change in fair value of contingent consideration	831	6,223
(Recovery of) provision for doubtful accounts, net	(246)	1,717
Stock compensation	9,821	12,029
Other	559	857
Changes in operating assets and liabilities:
Trade accounts receivable	(20,979)	(47,601)
Inventories	(143,224)	(232,897)
Prepaid expenses and other current assets	(17,985)	24,486
Income tax receivable	(8,796)	(16,838)
Other assets	(4,314)	(3,142)
Trade accounts payable	14,521	53,433
Contingent consideration	(6,458)	(959)
Accrued expenses	7,466	(23,623)
Income taxes payable	(22,305)	(13,351)
Long-term liabilities	3,444	2,425
Net cash used in operating activities	(155,464)	(183,385)
Cash flows from investing activities:
Purchases of property and equipment	(55,760)	(42,002)
Acquisition of businesses	0	(8,329)
Equity method investment	0	(500)
Purchases of intangible assets	(701)	(3,985)
Net cash used in investing activities	(56,461)	(54,816)
Cash flows from financing activities:
Cash paid for shares withheld for taxes	(4,845)	(5,750)
Excess tax benefits from stock compensation	1,033	2,108
Cash paid for repurchases of common stock	0	(184,695)
Contingent consideration and deferred payments paid	(22,628)	(29,041)
Cash paid for noncontrolling interest in consolidated entity	0	(20,000)
Proceeds from issuance of short-term borrowing	286,458	275,000
Cash paid for repayment of short-term borrowings	(74,000)	(1,714)
Net cash provided by financing activities	186,018	35,908
Effect of exchange rates on cash	(233)	323
Net change in cash and cash equivalents	(26,140)	(201,970)
Cash and cash equivalents at beginning of period	110,247	263,606
Cash and cash equivalents at end of period	84,107	61,636
Cash paid during the period for:
Income taxes	30,225	39,786
Interest	1,329	453
Non-cash investing activity:
Accruals for purchases of property and equipment	6,381	2,355
Contingent consideration arrangement for acquisition of businesses	0	1,120
Deferred purchase payments for acquisition of business	0	3,671
Accruals for asset retirement obligations	26	146
Non-cash financing activity:
Accruals for shares withheld for taxes	$ 1,658	$ 752