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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Activities      
Net income $ 70,629 $ 40,015 $ 28,255
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 14,888 12,148 9,207
Stock-based compensation 4,718 2,953 2,589
Excess and obsolescence inventory reserve 761 (234) (1,057)
Loss (gain) on sale of assets (944) (26) 22
Deferred income taxes (1,480) 8,205 493
Impairment charge (1,134)      
Changes in operating assets and liabilities:      
Trade receivables (793) (10,660) (6,516)
Inventories (6,553) (156) 888
Trade accounts payable and accrued expenses 9,908 11,807 3,932
Employee compensation and benefits (4,345) 3,959 (1,967)
Product liability (689) 724 (1,060)
Prepaid expenses, other assets and other liabilities 1,947 (10,961) (1,333)
Income taxes payable 272 (365) (962)
Cash provided by operating activities 87,185 57,409 32,491
Investing Activities      
Property, plant and equipment additions (27,282) (22,135) (19,409)
Purchases of short-term investments (59,966) (122,978) (164,966)
Proceeds from sales or maturities of short-term investments 59,966 175,471 163,214
Proceeds from sale of assets 1,003 319 21
Cash (used for) provided by investing activities (26,279) 30,677 (21,140)
Financing Activities      
Dividends paid (111,523) (8,159) (6,317)
Tax benefit from exercise of stock options 3,474 3,855 1,923
Repurchase of common stock    (1,999) (5,718)
Payment of employee withholding tax related to share-based compensation (3,083) (5,859) (1,115)
Proceeds from exercise of stock options 148      
Cash used for financing activities (110,984) (12,162) (11,227)
(Decrease) increase in cash and cash equivalents (50,078) 75,924 124
Cash and cash equivalents at beginning of period 81,056 5,132 5,008
Cash and cash equivalents at end of period $ 30,978 $ 81,056 $ 5,132