Interim Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 721,996	$ 653,656	$ 1,382,817	$ 1,248,223
Gross profit	412,625	375,612	787,558	719,001
Research and development	35,315	32,582	70,028	63,782
Selling, general and administrative	208,024	195,624	408,698	381,280
Amortization	11,970	10,249	23,705	20,294
Interest expense	8,309	8,171	16,668	15,912
Restructuring Charges	7,321	4,023	11,734	5,455
Other charges (income), net	(1,916)	(1,884)	(4,316)	(8,417)
Earnings before taxes	143,602	126,847	261,041	240,695
Provision for taxes	32,134	25,267	56,269	46,649
Net earnings	$ 111,468	$ 101,580	$ 204,772	$ 194,046
Basic earnings per common share:
Net earnings	$ 4.41	$ 3.94	$ 8.07	$ 7.51
Weighted average number of common shares	25,299,414	25,751,374	25,383,402	25,841,243
Diluted earnings per common share:
Net earnings	$ 4.31	$ 3.84	$ 7.88	$ 7.32
Weighted average number of common and common equivalent shares	25,867,383	26,439,529	25,979,508	26,514,311
Comprehensive Income, Net of Tax (Note 9)	$ 82,263	$ 134,314	$ 204,457	$ 250,658
Product [Member]
Revenues	562,476	512,848	1,073,422	970,108
Cost of Goods and Services Sold	221,729	199,586	424,316	374,899
Service [Member]
Revenues	159,520	140,808	309,395	278,115
Cost of Goods and Services Sold	$ 87,642	$ 78,458	$ 170,943	$ 154,323