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CONDENSED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Operating Activities    
Net income $ 50,842 $ 29,496
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation 10,151 8,792
Slow moving inventory valuation adjustment 446 (35)
Stock-based compensation 3,317 2,110
Gain on sale of assets (65) (82)
Deferred income taxes 265 (1,376)
Changes in operating assets and liabilities:    
Trade receivables (5,249) (1,856)
Inventories (3,599) 2,107
Trade accounts payable and accrued expenses 2,571 2,870
Employee compensation and benefits 1,709 1,007
Product liability (352) 454
Prepaid expenses, other assets and other liabilities 1,656 (4,419)
Income taxes payable 631 1,147
Cash provided by operating activities 61,793 42,967
Investing Activities    
Property, plant and equipment additions (20,315) (12,209)
Proceeds from sale of assets 65 127
Purchases of short-term investments (59,966) (122,978)
Proceeds from maturities of short-term investments 29,993 149,473
Cash (used for) provided by investing activities (50,223) 14,413
Financing Activities    
Tax benefit from exercise of stock options 1,037 3,087
Repurchase of common stock    (1,999)
Payment of employee withholding tax related to share-based compensation (1,045) (4,782)
Dividends paid (17,495) (5,474)
Cash used for financing activities (17,503) (9,168)
(Decrease) Increase in cash and cash equivalents (5,933) 48,212
Cash and cash equivalents at beginning of period 81,056  
Cash and cash equivalents at end of period $ 75,123 $ 53,344