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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]    
Net sales $ 399,572 $ 294,561
Costs of goods sold 246,110 183,556
Gross profit 153,462 111,005
Operating expenses:    
Selling and service 31,681 25,126
Research and development 6,645 5,055
General and administrative 12,426 9,106
Amortization of intangible assets 6,185 12,225
Total operating expenses 56,937 51,512
Income from operations 96,525 59,493
Other (expense) income:    
Interest expense (15,675) (5,674)
Investment income 17 19
Loss on extinguishment of debt (1,839) (4,309)
Other, net 396 (425)
Total other expense, net (17,101) (10,389)
Income before provision for income taxes 79,424 49,104
Provision for income taxes 28,750 19,044
Net income 50,674 30,060
Net income per common share - basic: (in dollars per share) $ 0.75 $ 0.45
Weighted average common shares outstanding - basic: (in shares) 67,864,475 67,200,480
Net income per common share - diluted: (in dollars per share) $ 0.73 $ 0.44
Weighted average common shares outstanding - diluted: (in shares) 69,554,941 68,637,927
Comprehensive income $ 51,676 $ 29,991