Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 2,935,586	$ 2,725,053	$ 2,508,257
Gross profit	1,684,378	1,575,751	1,437,732
Research and development	141,071	128,308	119,196
Selling, general and administrative	812,802	794,861	745,358
Amortization	47,524	42,671	36,052
Interest Expense	34,511	32,785	28,026
Restructuring Charges	18,420	12,772	6,235
Other Charges (Income), Net	(21,808)	(9,868)	(1,328)
Earnings Before Taxes	651,858	574,222	504,193
Provision for taxes	139,247	198,250	119,823
Net earnings	$ 512,611	$ 375,972	$ 384,370
Basic earnings per common share:
Net earnings	$ 20.33	$ 14.62	$ 14.49
Weighted average number of common shares	25,215,674	25,713,575	26,517,768
Diluted earnings per common share:
Net earnings	$ 19.88	$ 14.24	$ 14.22
Weighted average number of common and common equivalent shares	25,781,324	26,393,783	27,023,905
Product [Member]
Revenues	$ 2,300,075	$ 2,135,051	$ 1,957,879
Cost of Sales	914,086	831,355	765,608
Service [Member]
Revenues	635,511	590,002	550,378
Cost of Sales	$ 337,122	$ 317,947	$ 304,917