CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 444,736	$ 439,618
Cost of Goods and Services Sold	211,077	221,704
Gross profit	233,659	217,914
Operating expenses:
Research and development	47,998	44,561
Selling, general and administrative	104,579	107,683
Loss on sale of business	0	10,178
Total operating expenses	152,577	162,422
Earnings from operations	81,082	55,492
Interest expense	5,516	4,052
Interest income	(1,057)	(956)
Other expense (income), net	1,866	(2,219)
Earnings before income taxes	74,757	54,615
Income tax provision	13,009	15,420
Net earnings	$ 61,748	$ 39,195
Net earnings per share:
Basic earnings per share (in dollars per share)	$ 0.46	$ 0.28
Diluted earnings per share (in dollars per share)	$ 0.45	$ 0.28
Weighted Average Number of Shares Outstanding, Basic	135,541	138,504
Weighted Average Number of Shares Outstanding, Diluted	137,165	140,994