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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Product sales $ 1,385,256 $ 1,346,729 $ 1,312,503
Service sales 657,076 642,615 591,715
Total net sales 2,042,332 1,989,344 1,904,218
Cost of product sales 565,630 549,121 526,721
Cost of service sales 277,042 275,792 256,735
Total cost of sales 842,672 824,913 783,456
Gross profit 1,199,660 1,164,431 1,120,762
Selling and administrative expenses 495,747 512,707 492,965
Research and development expenses 118,545 107,726 100,536
Acquired in-process research and development (Note 2) 3,855 15,456  
Purchased intangibles amortization 10,123 10,634 9,918
Litigation provisions (Note 10) 3,939    
Operating income 567,451 517,908 517,343
Other expense (Note 3)     (1,575)
Interest expense (36,243) (34,191) (30,050)
Interest income 10,711 7,023 4,387
Income from operations before income taxes 541,919 490,740 490,105
Provision for income taxes 72,866 59,120 40,102
Net income $ 469,053 $ 431,620 $ 450,003
Net income per basic common share $ 5.70 $ 5.12 $ 5.27
Weighted-average number of basic common shares 82,336 84,358 85,426
Net income per diluted common share $ 5.65 $ 5.07 $ 5.20
Weighted-average number of diluted common shares and equivalents 83,087 85,151 86,546