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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Product sales $ 1,312,503 $ 1,280,507 $ 1,322,136
Service sales 591,715 563,134 529,048
Total net sales 1,904,218 1,843,641 1,851,184
Cost of product sales 526,721 501,660 506,073
Cost of service sales 256,735 235,954 224,420
Total cost of sales 783,456 737,614 730,493
Gross profit 1,120,762 1,106,027 1,120,691
Selling and administrative expenses 492,965 477,270 490,011
Research and development expenses 100,536 96,004 92,347
Purchased intangibles amortization 9,918 13,829 9,733
Litigation provisions (Note 10)   7,434  
Operating income 517,343 511,490 528,600
Other expense (Note 3) (1,575)    
Interest expense (30,050) (28,073) (21,971)
Interest income 4,387 4,208 2,623
Income from operations before income taxes 490,105 487,625 509,252
Provision for income taxes 40,102 26,182 76,284
Net income $ 450,003 $ 461,443 $ 432,968
Net income per basic common share $ 5.27 $ 5.25 $ 4.77
Weighted-average number of basic common shares 85,426 87,841 90,833
Net income per diluted common share $ 5.20 $ 5.19 $ 4.69
Weighted-average number of diluted common shares and equivalents 86,546 88,979 92,325