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CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Operating Activities    
Net income    $ 18,759
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation    5,860
Slow moving inventory valuation adjustment    (176)
Stock-based compensation    1,247
Gain on sale of assets    (7)
Deferred income taxes    1,111
Changes in operating assets and liabilities:    
Trade receivables   (292)
Inventories   5,954
Trade accounts payable and accrued expenses   2,298
Employee compensation and benefits   (580)
Product liability   135
Prepaid expenses, other assets and other liabilities   (3,434)
Income taxes payable   1,499
Cash provided by operating activities   32,374
Investing Activities    
Property, plant and equipment additions   (7,719)
Proceeds from sale of assets   16
Purchases of short-term investments   (47,496)
Proceeds from maturities of short-term investments   35,496
Cash used for investing activities   (19,703)
Financing Activities    
Tax benefit from exercise of stock options   1,441
Repurchase of common stock   (1,999)
Payment of employee withholding tax related to share-based compensation   (2,432)
Dividends paid   (2,775)
Cash used for financing activities   (5,765)
(Decrease) Increase in cash and cash equivalents    6,906
Cash and cash equivalents at beginning of period 81,056 [1] 5,132
Cash and cash equivalents at end of period    $ 12,038
[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.