Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 82,442us-gaap_NetIncomeLoss	$ 111,159us-gaap_NetIncomeLoss	$ 56,607us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	41,259us-gaap_Depreciation	36,179us-gaap_Depreciation	31,757us-gaap_Depreciation
Amortization	5,190us-gaap_AdjustmentForAmortization	4,763us-gaap_AdjustmentForAmortization	3,956us-gaap_AdjustmentForAmortization
Deferred income taxes	12,027	(5,786)	9,064
Asset impairments	802us-gaap_AssetImpairmentCharges	5,504us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Thailand flood insurance recovery	(550)us-gaap_InsuranceRecoveries	(10,748)us-gaap_InsuranceRecoveries	0us-gaap_InsuranceRecoveries
Gain on sale of Tianjin Subsidiary	(1,547)us-gaap_GainLossOnSaleOfBusiness	0us-gaap_GainLossOnSaleOfBusiness	0us-gaap_GainLossOnSaleOfBusiness
Gain on the sale of property, plant and equipment	(78)	(1,161)	(229)
Stock-based compensation expense	6,427us-gaap_ShareBasedCompensation	7,053us-gaap_ShareBasedCompensation	6,270us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation	(634)	(354)	(76)
Changes in operating assets and liabilities, net of effects from business acquisitions:
Accounts receivable	37,862	(56,633)	(34,359)
Inventories	(6,153)us-gaap_IncreaseDecreaseInInventories	(17,832)us-gaap_IncreaseDecreaseInInventories	66,089us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(1,278)	6,335	32,375
Accounts payable	(36,646)	19,725	(21,081)
Accrued liabilities	(1,178)	(9,305)	3,176
Income taxes	(1,284)	10,178	(2,402)
Net cash provided by operations	136,661	99,077	151,147
Cash flows from investing activities:
Proceeds from sales and redemptions of investments	10,282	821	15,825
Additions to property, plant and equipment	(44,211)	(26,829)	(47,911)
Proceeds from the sale of property, plant and equipment	452	1,908	346
Additions to purchased software	(1,178)us-gaap_PaymentsForSoftware	(1,908)us-gaap_PaymentsForSoftware	(1,124)us-gaap_PaymentsForSoftware
Business acquisition, net of cash acquired	750	(94,271)	0
Proceeds From sale of subsidiary, net of cash disposed	5,512	0	0
Thailand flood property insurance proceeds	550	10,748	23,372
Other	367	814	0
Net cash used in investing activities	(27,476)	(108,717)	(9,492)
Cash flows from financing activities:
Proceeds from stock options exercised	18,867	11,203	4,657
Excess tax benefits from stock-based compensation	634	354	76
Principal payments on capital lease obligations	(582)	(497)	(419)
Share repurchases	(43,800)	(41,168)	(47,106)
Debt issuance costs	0us-gaap_PaymentsOfFinancingCosts	0us-gaap_PaymentsOfFinancingCosts	(931)us-gaap_PaymentsOfFinancingCosts
Net cash used in financing activities	(24,881)	(30,108)	(43,723)
Effect of exchange rate changes	(2,483)	724	2,727
Net increase (decrease) in cash and cash equivalents	81,821	(39,024)	100,659
Cash and cash equivalents at beginning of year	345,555	384,579	283,920
Cash and cash equivalents at end of period	$ 427,376	$ 345,555	$ 384,579

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-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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