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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Components of Other Comprehensive Income (Loss), Net of Tax | The accumulated balances related to each component of other comprehensive income (loss), net of tax, are as follows:
| Foreign Currency Translation Component |  | Pension and Other Postretirement Benefit Plans |  | Accumulated Other Comprehensive Income (Loss)
|  |  | (In thousands) |  |
Balance at December 31, 2018 | $ | (41,882) |  |  | $ | (33,025) |  |  | $ | (74,907) |
Other comprehensive gain (loss) attributable to Belden before reclassifications | 23,657 |  |  | (13,281) |  |  | 10,376 |
Amounts reclassified from accumulated other comprehensive income | — |  |  | 1,113 |  |  | 1,113 |
Net current period other comprehensive gain (loss) attributable to Belden | 23,657 |  |  | (12,168) |  |  | 11,489 |
Balance at December 31, 2019 | $ | (18,225) |  |  | $ | (45,193) |  |  | $ | (63,418) |
Other comprehensive loss attributable to Belden before reclassifications | (123,101) |  |  | (20,800) |  |  | (143,901) |
Amounts reclassified from accumulated other comprehensive income | 10,145 |  |  | 5,323 |  |  | 15,468 |
Net current period other comprehensive loss attributable to Belden | (112,956) |  |  | (15,477) |  |  | (128,433) |
Balance at December 31, 2020 | $ | (131,181) |  |  | $ | (60,670) |  |  | $ | (191,851) |
Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) | The following table summarizes the effects of reclassifications from accumulated other comprehensive income (loss):
| Amount Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Consolidated Statements of Operations and Comprehensive Income (Loss)
| (In thousands) |  |
Amortization of pension and other postretirement benefit plan items: |  |  |
Settlement loss | $ | 3,153 |  |  | (1) |
Accumulated losses of Grass Valley disposal group | 771 |  |  | (2) |
Actuarial losses | 2,871 |  |  | (1) |
Prior service cost | 190 |  |  | (1) |
Total before tax | 6,985 |  |  |
Tax benefit | (1,662) |  |  |
Total net of tax | $ | 5,323 |  |  |
(1)The amortization of these accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit costs (see Note 19). (2)In addition, we reclassified $10.1 million of accumulated foreign currency translation losses associated with the Grass Valley disposal group that are included in the calculation of the loss on disposal of discontinued operations.

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