CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 25,982	$ 53,507	$ 80,264
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	59,063	56,927	47,365
Amortization of intangibles	5,130	4,511	4,431
Amortization of convertible senior notes issuance costs	0	412	549
Amortization of discount on convertible senior notes	0	6,032	7,656
Share-based compensation	14,398	13,703	13,051
Excess tax benefit from share-based compensation	(1,639)	(15,024)	(3,073)
Loss (gain) on disposal of property, plant and equipment	(3,554)	31	(1,665)
Gain (loss) on securities carried at fair value	(7,100)	1,039	0
Deferred income taxes	(13,051)	(21,916)	(4,040)
Other	(334)	(297)	(464)
Changes in operating assets:
Accounts receivable	(6,360)	(4,406)	(23,604)
Inventories	(5,492)	(20,187)	(30,388)
Prepaid expenses and other current assets	3,162	(7,483)	(2,290)
Changes in operating liabilities:
Accounts payable	(7,440)	(3,584)	7,032
Accrued liabilities	2,257	(8,513)	8,022
Other liabilities	(4,179)	3,069	2,445
Income taxes payable	3,378	3,829	12,714
Net cash provided by operating activities	64,221	61,650	118,005
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisitions, net of cash acquired	(20,048)	0	0
Purchases of equity securities	(3,413)	(14,117)	0
Proceeds from sale of debt securities	0	0	296,600
Purchases of property, plant and equipment	(58,166)	(80,941)	(88,809)
Proceeds from sales of property, plant and equipment	1,969	40	2,163
Proceeds from sales of intangibles	2,122	0	0
Other	117	(3,294)	(385)
Net cash provided by (used in) investing activities	(77,419)	(98,312)	209,569
CASH FLOWS FROM FINANCING ACTIVITIES
Advance on lines of credit and short term debt	3,659	8,000	3,762
Repayments on lines of credit and short-term debt	(9,556)	0	(303,192)
Net proceeds from the issuance of common stock	1,318	3,526	4,818
Excess tax benefit from share-based compensation	1,639	15,024	3,073
Dividend to noncontrolling interest	0	0	(2,373)
Proceeds from long-term debt	71,720	0	0
Repayments of long-term debt	(30,445)	(134,706)	(1,165)
Repayments of capital lease obligations	(295)	(285)	(268)
Other	502	728	(4)
Net cash provided by (used by) financing activities	38,542	(107,713)	(295,349)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	2,267	2,984	(3,277)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	27,611	(141,391)	28,948
CASH AND CASH EQUIVALENTS, beginning of year	129,510	270,901	241,953
CASH AND CASH EQUIVALENTS, end of year	157,121	129,510	270,901
Cash paid during the year for:
Interest	914	3,322	4,638
Income taxes	17,086	12,118	9,617
Non-cash activities:
Property, plant and equipment purchased on accounts payable	(1,957)	(1,934)	2,229
Acquisition:
Fair value of assets acquired	76,438	0	0
Liability assumed	(13,924)	0	0
Cash acquired	6,108	0	0
Net assets acquired	$ 68,622	$ 0	$ 0