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Consolidated Statements Of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Revenue:      
Net sales - product $ 559,750 $ 559,821  
Rental revenue 2,858 2,858  
Total revenue 562,608 562,679  
Costs:      
Cost of goods sold - product 391,343 392,075  
Cost of rental 1,068 1,068  
Total costs 392,411 393,143  
Gross profit 170,197 169,536  
Selling, general, and administrative expenses 40,941 36,908  
Research, development, and testing expenses 31,021 27,895  
Operating (loss) profit 98,235 104,733  
Interest and financing expenses, net 5,109 4,482  
Loss on early extinguishment of debt 0 [1] 3,221 [1]  
Other income, net 747 1,773  
Income before income tax expense 93,873 98,803  
Income tax expense 26,038 32,256  
Net income $ 67,835 $ 66,547 $ 239,593
Earnings per share - basic and diluted (in dollars per share) $ 5.07 $ 4.96  
Cash dividends declared per common share (in dollars per share) $ 0.90 $ 0.75  
[1] In March 2012, we entered into a $650 million five-year unsecured revolving credit facility which replaced our previous $300 million unsecured revolving credit facility. During 2012, we used a portion of the $650 million revolving credit facility to fund the early redemption of all of our then outstanding 7.125% senior notes (7.125% senior notes), as well as to repay the outstanding principal amount on the Foundry Park I mortgage loan. As a result, during the three months ended March 31, 2012, we recognized a loss on early extinguishment of debt of $3.2 million from accelerated amortization of financing fees associated with the prior revolving credit facility and costs associated with redeeming the 7.125% senior notes prior to maturity.