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Interim Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues $ 734,846 $ 698,799 $ 2,117,663 $ 1,947,022
Gross profit 419,254 400,975 1,206,812 1,119,976
Research and development 34,838 32,203 104,866 95,985
Selling, general and administrative 202,451 207,033 611,149 588,313
Amortization 11,856 10,716 35,561 31,010
Interest expense 9,003 8,248 25,671 24,160
Restructuring Charges 2,222 3,385 13,956 8,840
Other charges (income), net (1,479) (237) (5,795) (8,654)
Earnings before taxes 160,363 139,627 421,404 380,322
Provision for taxes 33,710 34,677 89,979 81,326
Net earnings $ 126,653 $ 104,950 $ 331,425 $ 298,996
Basic earnings per common share:        
Net earnings $ 5.04 $ 4.10 $ 13.10 $ 11.60
Weighted average number of common shares 25,126,061 25,613,433 25,296,680 25,764,472
Diluted earnings per common share:        
Net earnings $ 4.93 $ 3.99 $ 12.81 $ 11.31
Weighted average number of common and common equivalent shares 25,683,365 26,303,529 25,877,979 26,446,677
Comprehensive Income, Net of Tax (Note 9) $ 108,845 $ 125,699 $ 313,302 $ 376,357
Product [Member]        
Revenues 576,340 544,408 1,649,762 1,514,516
Cost of Goods and Services Sold 232,851 216,496 657,167 591,395
Service [Member]        
Revenues 158,506 154,391 467,901 432,506
Cost of Goods and Services Sold $ 82,741 $ 81,328 $ 253,684 $ 235,651