Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 3,085,177	$ 3,008,652	$ 2,935,586
Gross profit	1,801,031	1,741,211	1,684,378
Research and development	140,102	143,950	141,071
Selling, general and administrative	820,221	819,183	812,802
Amortization	56,665	49,690	47,524
Interest Expense	38,616	37,411	34,511
Restructuring Charges	10,516	15,760	18,420
Other Charges (Income), Net	(13,832)	(6,177)	(21,808)
Earnings Before Taxes	748,743	681,394	651,858
Provision for taxes	146,004	120,285	139,247
Net earnings	$ 602,739	$ 561,109	$ 512,611
Basic earnings per common share:
Net earnings	$ 25.24	$ 22.84	$ 20.33
Weighted average number of common shares	23,882,648	24,567,609	25,215,674
Diluted earnings per common share:
Net earnings	$ 24.91	$ 22.47	$ 19.88
Weighted average number of common and common equivalent shares	24,199,230	24,974,457	25,781,324
Product [Member]
Revenues	$ 2,405,172	$ 2,346,845	$ 2,300,075
Cost of Sales	954,697	929,669	914,086
Service [Member]
Revenues	680,005	661,807	635,511
Cost of Sales	$ 329,449	$ 337,772	$ 337,122