CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 434,124	$ 402,729	$ 840,938	$ 782,201
Cost of goods sold	227,392	219,407	442,885	421,189
Gross profit	206,732	183,322	398,053	361,012
Operating expenses:
Research and development	43,046	38,208	85,029	75,488
Selling, general and administrative	97,056	79,902	187,308	162,935
Total operating expenses	140,102	118,110	272,337	238,423
Earnings from operations	66,630	65,212	125,716	122,589
Interest expense	4,472	4,360	8,925	7,807
Interest income	(355)	(328)	(626)	(588)
Other income (expense), net	(1,027)	1,327	(1,687)	(103)
Earnings before income taxes	63,540	59,853	119,104	115,473
Income tax provision	12,127	14,485	25,120	68,980
Net earnings	$ 51,413	$ 45,368	$ 93,984	$ 46,493
Net earnings per share:
Basic earnings per share (in dollars per share)	$ 0.38	$ 0.33	$ 0.69	$ 0.34
Diluted earnings per share (in dollars per share)	$ 0.37	$ 0.33	$ 0.68	$ 0.33
Weighted Average Number of Shares Outstanding, Basic	136,865	137,861	136,613	137,686
Weighted Average Number of Shares Outstanding, Diluted	138,449	138,993	138,266	138,832