CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 481,998	$ 452,707	$ 926,734	$ 892,325
Cost of Goods and Services Sold	248,378	220,156	459,455	441,860
Gross profit	233,620	232,551	467,279	450,465
Operating expenses:
Research and development	53,021	46,429	101,019	90,990
Selling, general and administrative	116,862	97,456	221,441	205,139
Loss on sale of business	0	0	0	10,178
Total operating expenses	169,883	143,885	322,460	306,307
Earnings from operations	63,737	88,666	144,819	144,158
Interest expense	7,272	3,992	12,788	8,044
Interest income	(438)	(656)	(1,495)	(1,612)
Other (income) expense, net	(1,220)	2,377	646	158
Earnings before income taxes	58,123	82,953	132,880	137,568
Income tax provision	12,005	11,390	25,014	26,810
Net earnings	$ 46,118	$ 71,563	$ 107,866	$ 110,758
Net earnings per share:
Basic earnings per share (in dollars per share)	$ 0.34	$ 0.52	$ 0.80	$ 0.80
Diluted earnings per share (in dollars per share)	$ 0.34	$ 0.51	$ 0.79	$ 0.79
Weighted Average Number of Shares Outstanding, Basic	135,519	137,749	135,530	138,124
Weighted Average Number of Shares Outstanding, Diluted	137,084	140,149	137,105	140,564