CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	$ 1,557,067	$ 1,530,654	$ 1,496,372
Cost of goods sold	803,506	780,281	759,362
Gross profit	753,561	750,373	737,010
Operating Expenses [Abstract]
Research and development	132,892	142,751	147,696
Selling, general and administrative	313,544	331,995	322,739
Restructuring expenses	1,361	16,383	25,832
Total operating expenses	447,797	491,129	496,267
Earnings from operations	305,764	259,244	240,743
Interest expense	14,086	14,593	14,091
Interest income	(1,167)	(1,405)	(1,058)
Other expense (income), net	(12,601)	(3,473)	(1,276)
Earnings from continuing operations before income taxes	305,446	249,529	228,986
Income tax provision	63,760	49,268	51,971
Net earnings	$ 241,686	$ 200,261	$ 177,015
Basic earnings per share:
Basic earnings per share	$ 1.73	$ 1.42	$ 1.24
Diluted earnings per share:
Diluted earnings per share	$ 1.72	$ 1.39	$ 1.22