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Interim Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Net sales |  |  |  |
Products | $ 469,548 | $ 488,829 | $ 1,332,154 | $ 1,379,655
Service | 134,606 | 140,271 | 389,758 | 408,900
Total net sales | 604,154 | 629,100 | 1,721,912 | 1,788,555
Cost of sales |  |  |  |
Products | 188,673 | 206,227 | 536,466 | 586,883
Service | 75,952 | 79,322 | 224,200 | 237,304
Gross profit | 339,529 | 343,551 | 961,246 | 964,368
Research and development | 29,711 | 30,352 | 87,966 | 91,974
Selling, general and administrative | 175,546 | 186,499 | 523,392 | 541,793
Amortization | 7,767 | 7,198 | 22,929 | 21,575
Interest expense | 7,029 | 5,991 | 20,696 | 17,613
Restructuring Charges | 2,561 | 1,050 | 5,188 | 4,447
Other charges (income), net | (8) | 625 | (858) | 1,348
Earnings before taxes | 116,923 | 111,836 | 301,933 | 285,618
Provision for taxes | 28,062 | 26,840 | 72,464 | 68,549
Net earnings | $ 88,861 | $ 84,996 | $ 229,469 | $ 217,069
Basic earnings per common share: |  |  |  |
Net earnings | $ 3.23 | $ 2.96 | $ 8.24 | $ 7.47
Weighted average number of common shares | 27,547,734 | 28,732,152 | 27,833,541 | 29,056,663
Diluted earnings per common share: |  |  |  |
Net earnings | $ 3.16 | $ 2.89 | $ 8.07 | $ 7.30
Weighted average number of common and common equivalent shares | 28,113,287 | 29,408,614 | 28,443,478 | 29,747,321
Comprehensive Income, Net of Tax (Note 9) | $ 48,248 | $ 44,540 | $ 204,380 | $ 176,076

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