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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Apr. 02, 2011
Operating Activities    
Net income $ 15,480 $ 7,947
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation 3,388 2,930
Slow moving inventory valuation adjustment (53) (125)
Stock-based compensation 928 459
Gain on sale of assets   (7)
Deferred income taxes (1,365) (1,556)
Changes in operating assets and liabilities:    
Trade receivables (6,801) 1,135
Inventories 2,649 6,404
Trade accounts payable and accrued expenses 2,611 3,319
Employee compensation and benefits (4,238) (2,384)
Product liability (65) 172
Prepaid expenses, other assets and other liabilities 5,119 (472)
Income taxes payable 4,188 2,914
Cash provided by operating activities 21,841 20,736
Investing Activities    
Property, plant and equipment additions (3,047) (4,306)
Proceeds from sale of assets   7
Purchases of short-term investments (19,994) (61,483)
Proceeds from maturities of short-term investments   46,994
Cash used for investing activities (23,041) (18,788)
Financing Activities    
Tax benefit from exercise of stock options 922 1,247
Repurchase of common stock   (1,999)
Payment of employee withholding tax related to share-based compensation (884)  
Dividends paid (4,059) (938)
Cash used for financing activities (4,021) (1,690)
(Decrease) Increase in cash and cash equivalents (5,221) 258
Cash and cash equivalents at beginning of period 81,056 [1] 5,132
Cash and cash equivalents at end of period $ 75,835 $ 5,390
[1] Note: The balance sheet at December 31, 2011 has been derived from the audited financial statements at that date but does not include all the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements.