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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Product sales $ 1,552,349 $ 1,460,296 $ 1,385,256
Service sales 756,729 707,127 657,076
Total net sales 2,309,078 2,167,423 2,042,332
Cost of product sales 623,214 595,796 565,630
Cost of service sales 323,853 295,657 277,042
Selling and administrative expenses 544,703 513,031 495,747
Research and development expenses 132,593 125,187 118,545
Litigation provisions (Note 11) 11,114 3,524 3,939
Purchased intangibles amortization 6,743 9,889 10,123
Acquired in-process research and development (Note 2) 5,000   3,855
Total costs and operating expenses 1,647,220 1,543,084 1,474,881
Operating income 661,858 624,339 567,451
Interest expense (56,839) (44,911) (36,243)
Interest income 36,078 20,686 10,711
Income before income taxes 641,097 600,114 541,919
Provision for income taxes 620,786 78,611 72,866
Net income $ 20,311 $ 521,503 $ 469,053
Net income per basic common share $ 0.25 $ 6.46 $ 5.7
Weighted-average number of basic common shares 79,793 80,786 82,336
Net income per diluted common share $ 0.25 $ 6.41 $ 5.65
Weighted-average number of diluted common shares and equivalents 80,604 81,417 83,087