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Revenue Impact of changes in accounting policies (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Apr. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | $ 875,374 | $ 878,510
Cost of sales and operating expenses | 678,099 | $ 687,966
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | 921,561 |
Cost of sales and operating expenses | 724,286 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | 46,187 |
Cost of sales and operating expenses | $ 46,187 |

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + 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 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales 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) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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