CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenue	$ 1,530,654	$ 1,496,372	$ 1,405,358
Cost of goods sold	780,281	759,362	670,174
Gross profit	750,373	737,010	735,184
Operating Expenses [Abstract]
Research and development	142,751	147,696	137,354
Selling, general and administrative	331,995	322,739	292,500
Restructuring expenses	16,383	25,832	2,000
Total operating expenses	491,129	496,267	431,854
Earnings from operations	259,244	240,743	303,330
Interest expense	14,593	14,091	11,659
Interest income	(1,405)	(1,058)	(1,582)
Other expense (income), net	(3,473)	(1,276)	1,341
Earnings from continuing operations before income taxes	249,529	228,986	291,912
Income tax provision	49,268	51,971	66,556
Earnings from continuing operations	200,261	177,015	225,356
Loss from discontinued operations, net of tax	0	0	(2,958)
Net earnings	$ 200,261	$ 177,015	$ 222,398
Basic earnings per share:
Continuing operations	$ 1.42	$ 1.24	$ 1.49
Discontinued operations	$ 0.00	$ 0.00	$ (0.02)
Basic earnings per share	$ 1.42	$ 1.24	$ 1.47
Diluted earnings per share:
Continuing operations	$ 1.39	$ 1.22	$ 1.47
Discontinued operations	$ 0.00	$ 0.00	$ (0.02)
Diluted earnings per share	$ 1.39	$ 1.22	$ 1.45