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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Activities      
Net income $ 111,272 $ 70,629 $ 40,015
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 20,362 14,888 12,148
Stock-based compensation 5,288 4,718 2,953
Excess and obsolescence inventory reserve 693 761 (234)
Loss (gain) on sale of assets 1 (944) (26)
Deferred income taxes 5,736 (1,480) 8,205
Impairment of assets 911 1,134   
Changes in operating assets and liabilities:      
Trade receivables (24,366) (793) (10,660)
Inventories (7,945) (6,553) (156)
Trade accounts payable and accrued expenses 9,231 9,908 11,807
Employee compensation and benefits 17,897 (4,345) 3,959
Product liability 179 (689) 724
Prepaid expenses, other assets and other liabilities (19,340) (321) (10,961)
Income taxes payable (250) 272 (365)
Cash provided by operating activities 119,669 87,185 57,409
Investing Activities      
Property, plant, and equipment additions (54,616) (27,282) (22,135)
Purchases of short-term investments   (59,966) (122,978)
Proceeds from sales or maturities of short- term investments    59,966 175,471
Net proceeds from sale of assets 233 1,003 319
Cash (used for) provided by investing activities (54,383) (26,279) 30,677
Financing Activities      
Dividends paid (41,079) (111,523) (8,159)
Tax benefit from exercise of stock options 2,302 3,474 3,855
Repurchase of common stock      (1,999)
Payment of employee withholding tax related to share-based compensation (2,423) (3,083) (5,859)
Proceeds from exercise of stock options    148   
Cash used for financing activities (41,200) (110,984) (12,162)
Increase (decrease) in cash and cash equivalents 24,086 (50,078) 75,924
Cash and cash equivalents at beginning of year 30,978 81,056 5,132
Cash and cash equivalents at end of year $ 55,064 $ 30,978 $ 81,056