CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 471,248	$ 434,898	$ 1,397,982	$ 1,327,223
Cost of Goods and Services Sold	241,661	212,824	701,116	654,684
Gross profit	229,587	222,074	696,866	672,539
Operating expenses:
Research and development	50,050	41,997	151,069	132,987
Selling, general and administrative	105,149	91,525	326,590	296,664
Loss on sale of business	0	0	0	10,178
Total operating expenses	155,199	133,522	477,659	439,829
Earnings from operations	74,388	88,552	219,207	232,710
Interest expense	7,582	4,042	20,370	12,086
Interest income	(612)	(979)	(2,107)	(2,591)
Other (income) expense, net	292	71	938	229
Earnings before income taxes	67,126	85,418	200,006	222,986
Income tax provision	5,079	12,267	30,093	39,077
Net earnings	$ 62,047	$ 73,151	$ 169,913	$ 183,909
Net earnings per share:
Basic earnings per share (in dollars per share)	$ 0.46	$ 0.53	$ 1.26	$ 1.33
Diluted earnings per share (in dollars per share)	$ 0.46	$ 0.52	$ 1.24	$ 1.31
Weighted Average Number of Shares Outstanding, Basic	134,741	138,190	135,264	138,146
Weighted Average Number of Shares Outstanding, Diluted	136,050	140,327	136,826	140,613