CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 24,104	$ 25,982	$ 53,507
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	65,529	59,063	56,927
Amortization of Intangible Assets	8,078	5,130	4,511
Impairment of goodwill	5,318	0	0
Amortization of convertible senior notes issuance costs	0	0	412
Amortization of discount on convertible senior notes	0	0	6,032
Share-based compensation	13,551	14,398	13,703
Excess tax benefit from share-based compensation	6,643	(1,644)	(15,024)
Loss (gain) on disposal of property, plant and equipment	270	(3,554)	31
Loss (gain) on securities carried at fair value	(601)	(7,100)	1,039
Deferred income taxes	(1,959)	(13,051)	(21,916)
Other	3,069	(334)	(297)
Changes in operating assets:
Accounts receivable	(18,241)	(6,360)	(4,406)
Inventories	14,860	(5,492)	(20,187)
Prepaid expenses and other current assets	(3,803)	3,162	(7,483)
Changes in operating liabilities:
Accounts payable	(8,594)	(7,440)	(3,584)
Accrued liabilities	171	2,257	(8,513)
Other liabilities	1,957	(4,179)	3,069
Income taxes payable	(461)	3,378	3,829
Net cash provided by operating activities	109,891	64,216	61,650
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisitions, net of cash acquired	(124,916)	(20,048)	0
Decrease in restricted cash	6,886	0	0
Purchase of short-term investments	(22,922)	0	0
Purchases of equity securities	(5,393)	(3,413)	(14,117)
Proceeds from sale of equity securities	7,458	0	0
Purchases of property, plant and equipment	(47,054)	(58,166)	(80,941)
Proceeds from sales of property, plant and equipment	59	1,969	40
Proceeds from sales of intangibles	0	2,122	0
Other	(520)	117	(3,294)
Net cash used by investing activities	(186,402)	(77,419)	(98,312)
CASH FLOWS FROM FINANCING ACTIVITIES
Advance on lines of credit and short term debt	15,101	3,659	8,000
Repayments on lines of credit and short-term debt	(34,573)	(9,556)	0
Net proceeds from the issuance of common stock	2,635	1,318	3,526
Excess tax benefit from share-based compensation	(6,643)	1,644	15,024
Proceeds from long-term debt	181,000	71,720	0
Repayments of long-term debt	(42,145)	(30,445)	(134,706)
Repayments of capital lease obligations	(627)	(295)	(285)
Other	(2,387)	502	728
Net cash provided by (used by) financing activities	112,361	38,547	(107,713)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	3,664	2,267	2,984
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	39,514	27,611	(141,391)
CASH AND CASH EQUIVALENTS, beginning of year	157,121	129,510	270,901
CASH AND CASH EQUIVALENTS, end of year	196,635	157,121	129,510
Cash paid during the year for:
Interest	4,373	914	3,322
Income taxes	10,396	17,086	12,118
Non-cash activities:
Property, plant and equipment purchased on accounts payable	2,714	(1,957)	(1,934)
Acquisition:
Fair value of assets acquired	247,012	76,438	0
Liability assumed	(92,277)	(13,924)	0
Cash acquired	(29,819)	6,108	0
Net assets acquired	$ 124,916	$ 68,622	$ 0