Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net (loss) income	$ (12,104)	$ 12,305
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Depreciation, amortization, and accretion	14,666	11,539
Change in fair value of contingent consideration	6,223
Provision for (recovery of) doubtful accounts, net	479	(53)
Write-down of inventory	1,593	3,005
Stock compensation	8,957	6,830
Other	295	(437)
Changes in operating assets and liabilities:
Trade accounts receivable	69,714	9,763
Inventories	(94,580)	(88,054)
Prepaid expenses and other current assets	25,307	(5,880)
Income tax receivable	(16,858)	(16,285)
Other assets	(2,768)	(3,070)
Trade accounts payable	80,919	40,302
Contingent consideration	(959)
Accrued expenses	(25,379)	(28,959)
Income taxes payable	(25,694)	(20,902)
Long-term liabilities	757	1,517
Net cash provided by (used in) operating activities	30,568	(78,379)
Cash flows from investing activities:
Purchases of property and equipment	(25,951)	(13,910)
Equity method investment	(2,000)
Purchases of intangible assets		(4,458)
Net cash used in investing activities	(27,951)	(18,368)
Cash flows from financing activities:
Cash paid for shares withheld for taxes	(4,725)	(10,682)
Excess tax benefits from stock compensation	1,795	6,641
Cash paid for repurchases of common stock	(100,000)	(19,918)
Contingent consideration paid	(29,041)
Cash paid for noncontrolling interest in consolidated entity	(20,000)
Net cash used in financing activities	(151,971)	(23,959)
Effect of exchange rates on cash	149	650
Net change in cash and cash equivalents	(149,205)	(120,056)
Cash and cash equivalents at beginning of period	263,606	445,226
Cash and cash equivalents at end of period	114,401	325,170
Cash paid during the period for:
Income taxes	35,916	35,777
Interest	47	12
Non-cash investing activity:
Accruals for purchases of property and equipment	1,034	162
Accruals for asset retirement obligations	62	13
Non-cash financing activity:
Accruals for shares withheld for taxes	$ 1,014	$ 1,934