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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 43,670 $ 38,492
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 29,635 26,459
Deferred income taxes 9,001 7,876
Gain on the sale of property, plant and equipment (1,260) (204)
Asset impairments 4,825 0
Stock-based compensation expense 5,310 4,723
Excess tax benefit from stock-based compensation (285) (25)
Changes in operating assets and liabilities, net of effects from business acquisition:    
Accounts receivable 47,137 (30,795)
Inventories (56,453) 14,325
Prepaid expenses and other assets 4,778 29,373
Accounts payable 24,507 (15,327)
Accrued liabilities (8,701) (1,258)
Income taxes (2,233) (3,373)
Net cash provided by operations 99,931 70,266
Cash flows from investing activities:    
Proceeds from sales and redemptions of investments 25 11,025
Additions to property, plant and equipment (18,268) (34,458)
Proceeds from the sale of property, plant and equipment 1,796 228
Additions to purchased software (1,879) (1,050)
Business acquisition, net of cash acquired (19,270) 0
Thailand flood property insurance proceeds 0 22,351
Net cash used in investing activities (37,596) (1,904)
Cash flows from financing activities:    
Proceeds from stock options exercised 10,405 3,461
Excess tax benefits from stock-based compensation 285 25
Principal payments on capital lease obligations (368) (310)
Share repurchases (30,673) (31,387)
Debt issuance costs 0 (867)
Net cash used in financing activities (20,351) (29,078)
Effect of exchange rate changes (3) 2,574
Net increase in cash and cash equivalents 41,981 41,858
Cash and cash equivalents at beginning of year 384,579 283,920
Cash and cash equivalents at end of year $ 426,560 $ 325,778