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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 04, 2021 | Mar. 29, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total before tax | $ 36,621 | $ 17,083
Income tax expense | (7,880) | (2,192)
Net income (loss) attributable to Belden stockholders | 28,666 | $ (11,189)
Reclassification out of Accumulated Other Comprehensive Income | Actuarial losses |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other nonoperating expense (income) | 973 |
Reclassification out of Accumulated Other Comprehensive Income | Prior service cost |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other nonoperating expense (income) | 28 |
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Benefit Plans |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total before tax | 1,001 |
Income tax expense | (237) |
Net income (loss) attributable to Belden stockholders | $ 764 |

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