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CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue, Net [Abstract] |  |  |
Product sales | $ 1,854,216 | $ 1,714,358 | $ 1,796,802
Service sales | 416,810 | 394,573 | 408,881
Net sales | 2,271,026 | 2,108,931 | 2,205,683
Cost of Revenue [Abstract] |  |  |
Cost of product sales | 1,184,358 | 1,100,287 | 1,156,596
Cost of service sales | 268,073 | 258,161 | 265,832
Total cost of sales | 1,452,431 | 1,358,448 | 1,422,428
Gross profit | 818,595 | 750,483 | 783,255
Research and development expenses | (60,308) | (58,592) | (60,837)
Selling expenses | (120,002) | (111,228) | (121,482)
General and administrative expenses | (298,542) | (272,565) | (290,319)
Operating income | 339,743 | 308,098 | 310,617
Interest expense | (41,471) | (41,248) | (36,038)
Other income, net | 1,347 | 1,111 | 615
Earnings before income taxes | 299,619 | 267,961 | 275,194
Provision for income taxes | (84,728) | (78,579) | (82,946)
Earnings from continuing operations | 214,891 | 189,382 | 192,248
Discontinued operations, net of taxes |  |  |
Loss from discontinued operations, net of taxes | 0 | 2,053 | 46,787
Net earnings | $ 214,891 | $ 187,329 | $ 145,461
Basic earnings per share |  |  |
Earnings from continuing operations | $ 4.86 | $ 4.27 | $ 4.12
Earnings from discontinued operations | 0.00 | (0.05) | (1.00)
Total | 4.86 | 4.22 | 3.12
Diluted earnings per share |  |  |
Earnings from continuing operations | 4.80 | 4.20 | 4.04
Earnings from discontinued operations | 0.00 | (0.05) | (0.99)
Total | 4.80 | 4.15 | 3.05
Dividends per share | $ 0.56 | $ 0.52 | $ 0.52
Weighted average shares outstanding: |  |  |
Basic | 44,182 | 44,389 | 46,624
Diluted | 44,761 | 45,045 | 47,616

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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