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Consolidating Financial Information (Consolidating Statements of Income and Comprehensive Income) (Details) (USD $)
In Thousands, 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 (expense), net 747 1,773  
(Loss) income before income taxes and equity income of subsidiaries 93,873 98,803  
Income tax (benefit) expense 26,038 32,256  
Equity income of subsidiaries 0 0  
Net income 67,835 66,547 239,593
Other comprehensive (loss) income (16,692) 8,085 (11,957)
Comprehensive income 51,143 74,632  
Parent Company [Member]
      
Revenue:      
Net sales - product 0 0  
Rental revenue 0 0  
Total revenue 0 0  
Costs:      
Cost of goods sold - product 0 0  
Cost of rental 0 0  
Total costs 0 0  
Gross profit 0 0  
Selling, general, and administrative expenses 1,684 1,450  
Research, development, and testing expenses 0 0  
Operating (loss) profit (1,684) (1,450)  
Interest and financing expenses, net 4,810 3,377  
Loss on early extinguishment of debt   3,221  
Other income (expense), net 700 1,744  
(Loss) income before income taxes and equity income of subsidiaries (5,794) (6,304)  
Income tax (benefit) expense (2,013) (2,584)  
Equity income of subsidiaries 71,616 70,267  
Net income 67,835 66,547  
Other comprehensive (loss) income (16,692) 8,085  
Comprehensive income 51,143 74,632  
Guarantor Subsidiaries [Member]
      
Revenue:      
Net sales - product 211,694 225,709  
Rental revenue 2,858 2,858  
Total revenue 214,552 228,567  
Costs:      
Cost of goods sold - product 102,006 99,176  
Cost of rental 1,068 1,068  
Total costs 103,074 100,244  
Gross profit 111,478 128,323  
Selling, general, and administrative expenses 21,792 27,819  
Research, development, and testing expenses 21,952 21,120  
Operating (loss) profit 67,734 79,384  
Interest and financing expenses, net (610) 87  
Loss on early extinguishment of debt   0  
Other income (expense), net 3 (31)  
(Loss) income before income taxes and equity income of subsidiaries 68,347 79,266  
Income tax (benefit) expense 19,819 29,124  
Equity income of subsidiaries 0 0  
Net income 48,528 50,142  
Other comprehensive (loss) income (3,514) 2,778  
Comprehensive income 45,014 52,920  
Non-Guarantor Subsidiaries [Member]
      
Revenue:      
Net sales - product 348,056 334,112  
Rental revenue 0 0  
Total revenue 348,056 334,112  
Costs:      
Cost of goods sold - product 289,337 292,899  
Cost of rental 0 0  
Total costs 289,337 292,899  
Gross profit 58,719 41,213  
Selling, general, and administrative expenses 17,465 7,639  
Research, development, and testing expenses 9,069 6,775  
Operating (loss) profit 32,185 26,799  
Interest and financing expenses, net 909 1,018  
Loss on early extinguishment of debt   0  
Other income (expense), net 44 60  
(Loss) income before income taxes and equity income of subsidiaries 31,320 25,841  
Income tax (benefit) expense 8,232 5,716  
Equity income of subsidiaries 0 0  
Net income 23,088 20,125  
Other comprehensive (loss) income (14,001) 4,730  
Comprehensive income 9,087 24,855  
Total Consolidating Adjustments [Member]
      
Revenue:      
Net sales - product 0 0  
Rental revenue 0 0  
Total revenue 0 0  
Costs:      
Cost of goods sold - product 0 0  
Cost of rental 0 0  
Total costs 0 0  
Gross profit 0 0  
Selling, general, and administrative expenses 0 0  
Research, development, and testing expenses 0 0  
Operating (loss) profit 0 0  
Interest and financing expenses, net 0 0  
Loss on early extinguishment of debt   0  
Other income (expense), net 0 0  
(Loss) income before income taxes and equity income of subsidiaries 0 0  
Income tax (benefit) expense 0 0  
Equity income of subsidiaries (71,616) (70,267)  
Net income (71,616) (70,267)  
Other comprehensive (loss) income 17,515 (7,508)  
Comprehensive income $ (54,101) $ (77,775)  
[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.