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Statements of Consolidated Income - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement [Abstract] |  |  |
Net sales | $ 444,861 | $ 420,878 | $ 378,212
Cost of products sold | 304,266 | 288,647 | 259,584
GROSS PROFIT | 140,595 | 132,231 | 118,628
Costs and expenses |  |  |
Selling | 36,609 | 36,358 | 34,048
General and administrative | 51,806 | 45,398 | 43,160
Research and engineering | 17,187 | 15,107 | 14,327
Other operating expenses - net | 2,366 | 2,434 | 985
Total costs and expenses | 107,968 | 99,297 | 92,520
OPERATING INCOME | 32,627 | 32,934 | 26,108
Other income (expense) |  |  |
Interest income | 783 | 486 | 430
Interest expense | (2,217) | (1,290) | (1,061)
Other income | 265 | 458 | 329
Total other income (expense) | (1,169) | (346) | (302)
INCOME BEFORE INCOME TAXES | 31,458 | 32,588 | 25,806
Income taxes | 8,122 | 6,007 | 13,152
NET INCOME | 23,336 | 26,581 | 12,654
Less: Net income attributable to noncontrolling interests | (33) | 0 | 0
NET INCOME ATTRIBUTABLE TO PREFORMED LINE PRODUCTS COMPANY SHAREHOLDERS | $ 23,303 | $ 26,581 | $ 12,654
AVERAGE NUMBER OF SHARES OF COMMON STOCK OUTSTANDING: |  |  |
Basic | 5,031 | 5,032 | 5,102
Diluted | 5,087 | 5,107 | 5,133
EARNINGS PER SHARE OF COMMON STOCK ATTRIBUTABLE TO PREFORMED LINE PRODUCTS COMPANY SHAREHOLDERS: |  |  |
Basic | $ 4.63 | $ 5.28 | $ 2.48
Diluted | $ 4.58 | $ 5.21 | $ 2.47

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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