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CONDENSED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Operating Activities    
Net income $ 23,718 $ 15,480
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 4,501 3,388
Slow moving inventory valuation adjustment 235 (53)
Stock-based compensation 1,330 928
Gain on sale of assets (70)   
Deferred income taxes 2,684 1,365
Changes in operating assets and liabilities:    
Trade receivables (16,464) (6,801)
Inventories 1,684 2,649
Trade accounts payable and accrued expenses 2,836 2,611
Employee compensation and benefits 3,678 (4,238)
Product liability 186 (65)
Prepaid expenses, other assets and other liabilities (2,676) 5,119
Income taxes payable 14,133 4,188
Cash provided by operating activities 30,407 21,841
Investing Activities    
Property, plant and equipment additions (7,705) (3,047)
Proceeds from sale of assets 70   
Purchases of short-term investments    (19,994)
Cash used for investing activities (7,635) (23,041)
Financing Activities    
Tax benefit from exercise of stock options 1,747 922
Remittance of taxes withheld from employees related to share-based compensation (2,082) (884)
Dividends paid (7,804) (4,059)
Cash used for financing activities (8,139) (4,021)
Increase (decrease) in cash and cash equivalents 14,633 (5,221)
Cash and cash equivalents at beginning of period 30,978 [1] 81,056
Cash and cash equivalents at end of period $ 45,611 $ 75,835
[1] The balance sheet at December 31, 2012 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.