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	$ 98,548	$ 44,045
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Depreciation and amortization	35,865	32,753
Deferred income tax provision	6,906	8,038
Noncash convertible debt conversion charge	0	16,135
Supply agreement termination income	(26,134)	0
Stock-based compensation	2,959	1,748
Excess tax benefit from stock options exercised	(185)	0
Issuance of treasury stock under 401(k) plan	453	411
Gain on acquisition	0	(919)
(Increase) decrease in assets:
Accounts receivable	(24,099)	(132,294)
Inventories	(36,921)	(47,366)
Prepaid and other current assets	(17,619)	(9,456)
Other assets	3,699	2,870
Increase (decrease) in liabilities:
Accounts payable	25,893	69,540
Other current liabilities	4,786	10,224
Other liabilities	10,937	(7,412)
Net cash provided by (used for) operating activities	85,088	(11,683)
Cash flows from investing activities:
Capital expenditures	(36,319)	(17,901)
Acquisitions, net of cash acquired	(32,760)	(99,118)
Purchases of marketable securities	0	30,000
Other	636	1,941
Net cash used for investing activities	(68,443)	(145,078)
Cash flows from financing activities:
Repurchase of senior unsecured notes	0	(1,064)
Payment on debt	(14,434)	(629)
Term loan borrowing	4,378	14,148
Proceeds from exercise of stock options	925	477
Excess tax benefit from stock options exercised	185	0
Dividends paid	(634)	(598)
Net cash provided by (used for) financing activities	(9,580)	12,334
Effect of exchange rate changes on cash	(1,345)	(799)
Net increase (decrease) in cash and cash equivalents	5,720	(145,226)
Cash and cash equivalents, beginning of period	129,170	239,500
Cash and cash equivalents, end of period	134,890	94,274
Supplemental Cash Flow Information [Abstract]
Interest Paid	15,306	25,735
Income Taxes Paid	$ 63,669	$ 17,093