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Revenue Recognition (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2020 USD ($) day | Jun. 29, 2019 USD ($) | Jun. 27, 2020 USD ($) day | Jun. 29, 2019 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |
Standard terms of payment, number of days | day | 10 |  | 10 |
Net sales | $ 698,776 | $ 706,448 | $ 1,360,846 | $ 1,345,149
Warehouse and reload |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 601,279 | 594,024 | 1,163,472 | 1,117,250
Direct |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 107,848 | 121,856 | 217,129 | 245,212
Customer discounts and rebates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | (10,351) | (9,432) | (19,755) | (17,313)
Structural products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 249,571 | 224,528 | 490,349 | 421,314
Specialty products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 449,205 | $ 481,920 | $ 870,497 | $ 923,835

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