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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating Activities      
Net income $ 40,015 $ 28,255 $ 27,503
Adjustments to reconcile net income to cashprovided by operating activities:      
Depreciation 12,148 9,207 7,300
Stock-based compensation 2,953 2,589 4,205
Slow moving inventory valuation adjustment (234) (1,057) 239
Loss (gain) on sale of assets (26) 22 (45)
Deferred income taxes 8,205 493 2,060
Changes in operating assets and liabilities:      
Trade receivables (10,660) (6,516) 760
Inventories (156) 888 2,042
Trade accounts payable and accrued expenses 11,807 3,932 2,150
Employee compensation and benefits 3,959 (1,967) 4,896
Product liability 724 (1,060) 339
Prepaid expenses, other assets and other liabilities (10,961) (1,333) (2,132)
Income taxes payable (365) (962) (2,628)
Cash provided by operating activities 57,409 32,491 46,689
Investing Activities      
Property, plant, and equipment additions (22,135) (19,409) (13,819)
Purchases of short-term investments (122,978) (164,966) (77,281)
Proceeds from sales or maturities of short-term investments 175,471 163,214 45,098
Net proceeds from sale of assets 319 21 51
Cash provided by (used for) investing activities 30,677 (21,140) (45,951)
Financing Activities      
Dividends paid (8,159) (6,317) (5,816)
Tax benefit from exercise of stock options 3,855 1,923 1,442
Repurchase of common stock (1,999) (5,718) (14)
Payment of employee withholding tax related to share-based compensation (5,859) (1,115) (30)
Repayment of line of credit     (1,000)
Cash used for financing activities (12,162) (11,227) (5,418)
Increase (decrease) in cash and cash equivalents 75,924 124 (4,680)
Cash and cash equivalents at beginning of year 5,132 5,008 9,688
Cash and cash equivalents at end of year $ 81,056 $ 5,132 $ 5,008