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Interim Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net sales        
Products $ 512,848 $ 470,605 $ 970,108 $ 883,897
Service 140,808 137,681 278,115 264,063
Total net sales 653,656 608,286 1,248,223 1,147,960
Cost of sales        
Products 200,281 183,322 376,083 349,179
Service 78,458 77,388 154,323 151,298
Gross profit 374,917 347,576 717,817 647,483
Research and development 32,854 30,701 64,246 59,674
Selling, general and administrative 193,517 187,798 377,689 356,719
Amortization 10,249 8,655 20,294 17,079
Interest expense 8,171 6,872 15,912 13,452
Restructuring Charges 4,023 2,205 5,455 3,085
Other charges (income), net (744) 8,173 (6,474) 7,889
Earnings before taxes 126,847 103,172 240,695 189,585
Provision for taxes 25,267 23,584 46,649 44,323
Net earnings $ 101,580 $ 79,588 $ 194,046 $ 145,262
Basic earnings per common share:        
Net earnings $ 3.94 $ 2.99 $ 7.51 $ 5.42
Weighted average number of common shares 25,751,374 26,631,015 25,841,243 26,781,154
Diluted earnings per common share:        
Net earnings $ 3.84 $ 2.93 $ 7.32 $ 5.32
Weighted average number of common and common equivalent shares 26,439,529 27,143,284 26,514,311 27,283,012
Comprehensive Income, Net of Tax (Note 8) $ 134,314 $ 56,630 $ 250,658 $ 129,136