CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 464,712	$ 405,228	$ 1,305,650	$ 1,187,429
Cost of goods sold	241,821	213,852	684,706	635,041
Gross profit	222,891	191,376	620,944	552,388
Operating expenses:
Research and development	42,873	33,839	127,902	109,327
Selling, general and administrative	92,932	76,688	280,240	239,623
Total operating expenses	135,805	110,527	408,142	348,950
Earnings from operations	87,086	80,849	212,802	203,438
Interest expense	3,819	5,736	12,744	13,543
Interest income	(488)	(336)	(1,114)	(924)
Other (income) expense, net	(778)	241	(2,465)	138
Earnings before income taxes	84,533	75,208	203,637	190,681
Income tax provision	21,004	16,575	46,124	85,555
Net earnings	$ 63,529	$ 58,633	$ 157,513	$ 105,126
Net earnings per share:
Basic earnings per share (in dollars per share)	$ 0.46	$ 0.43	$ 1.15	$ 0.76
Diluted earnings per share (in dollars per share)	$ 0.46	$ 0.43	$ 1.13	$ 0.76
Weighted Average Number of Shares Outstanding, Basic	137,849	136,963	137,030	137,438
Weighted Average Number of Shares Outstanding, Diluted	139,419	137,938	138,853	138,594