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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Changes in Accumulated Other Comprehensive Loss | Changes in the accumulated other comprehensive income (loss) ("AOCI") balance by component consisted of the following for the respective years:
(in thousands) |  |  |  | Defined Benefit Pension Items |  | Other |  | Total
As of December 31, 2018 |  |  |  | $ | (95,365) |  |  | $ | (32) |  |  | $ | (95,397) |
Other comprehensive income (loss) before reclassifications, net of tax of $(1,874) and $(77) |  |  |  | (5,461) |  |  | (223) |  |  | (5,684) |
Amounts reclassified from AOCI, net of tax of $718 |  |  |  | 2,092 |  |  | — |  |  | 2,092 |
Net current-period other comprehensive income (loss) |  |  |  | (3,369) |  |  | (223) |  |  | (3,592) |
As of December 31, 2019 |  |  |  | (98,734) |  |  | (255) |  |  | (98,989) |
Other comprehensive income (loss) before reclassifications, net of tax of $(1,492) and $(23) |  |  |  | (4,803) |  |  | (75) |  |  | (4,878) |
Amounts reclassified from AOCI, net of tax of $1,164 |  |  |  | 3,748 |  |  | — |  |  | 3,748 |
Net current-period other comprehensive income (loss) |  |  |  | (1,055) |  |  | (75) |  |  | (1,130) |
As of December 31, 2020 |  |  |  | $ | (99,789) |  |  | $ | (330) |  |  | $ | (100,119) |

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