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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Amounts Included in Accumulated Other Comprehensive Loss, Net of Tax | Amounts included in accumulated other comprehensive loss, net of tax, were as follows:
| Unrecognized Net Defined Benefit Plan Costs |  | Change in Fair Value of Derivatives |  | Foreign Currency Translation |  | Total
| (Dollars in thousands)
Balance at December 31, 2022 | $ | (156,733) |  |  | $ | (772) |  |  | $ | (187,805) |  |  | $ | (345,310) |
Other comprehensive income before reclassifications | — |  |  | 2,736 |  |  | 35,279 |  |  | 38,015 |
Amounts reclassified from accumulated other comprehensive loss | 3,523 |  |  | 629 |  |  | 23,589 |  |  | 27,741 |
Other comprehensive income | 3,523 |  |  | 3,365 |  |  | 58,868 |  |  | 65,756 |
Balance at June 30, 2023 | $ | (153,210) |  |  | $ | 2,593 |  |  | $ | (128,937) |  |  | $ | (279,554) |

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