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Revenue Impact of changes in accounting policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net sales | $ 846,646 | $ 894,930 | $ 1,722,020 | $ 1,773,440
Cost of sales and operating expenses | 653,001 | $ 699,244 | 1,331,100 | $ 1,387,210
Adjustments | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net sales | 45,449 |  | 91,636 |
Cost of sales and operating expenses | 45,449 |  | 91,636 |
Balances without adoption of Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net sales | 892,095 |  | 1,813,656 |
Cost of sales and operating expenses | $ 698,450 |  | $ 1,422,736 |

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