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Interim Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues $ 679,452 $ 660,821
Gross profit 388,319 374,933
Research and development 36,053 34,713
Selling, general and administrative 204,425 200,674
Amortization 12,222 11,735
Interest Expense 9,094 8,359
Restructuring Charges 1,523 4,413
Other charges (income), net (674) (2,400)
Earnings before taxes 125,676 117,439
Provision for taxes 13,871 24,135
Net Income (Loss) Attributable to Parent $ 111,805 $ 93,304
Basic earnings per common share:    
Net earnings $ 4.50 $ 3.66
Weighted average number of common shares 24,851,340 25,468,323
Diluted earnings per common share:    
Net earnings $ 4.42 $ 3.58
Weighted average number of common and common equivalent shares 25,310,525 26,095,647
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 124,465 $ 122,194
Product [Member]    
Cost of Goods and Services Sold 210,216 202,587
Revenues 524,347 510,946
Service [Member]    
Cost of Goods and Services Sold 80,917 83,301
Revenues $ 155,105 $ 149,875