CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenue	$ 1,800,434	$ 1,662,167	$ 1,557,067
Cost of goods sold	941,658	895,046	803,506
Gross profit	858,776	767,121	753,561
Operating expenses:
Research and development	(170,735)	(147,537)	(132,892)
Selling, general and administrative	(373,867)	(322,435)	(313,544)
Restructuring expenses	(625)	(1,431)	(1,361)
Loss on net assets held for sale	23,588	0	0
Total operating expenses	568,815	471,403	447,797
Earnings from operations	289,961	295,718	305,764
Interest expense	16,804	18,071	14,086
Interest income	(1,764)	(1,402)	(1,167)
Other (income) expense, net	(4,144)	3,092	(12,601)
Earnings before income taxes	279,065	275,957	305,446
Income tax provision	171,842	109,331	63,760
Net earnings	$ 107,223	$ 166,626	$ 241,686
Net earnings per share:
Basic earnings per share (in dollars per share)	$ 0.78	$ 1.22	$ 1.73
Diluted earnings per share (in dollars per share)	$ 0.77	$ 1.20	$ 1.72