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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2021
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, 2020 | $ | (168,604) |  |  | $ | (4,656) |  |  | $ | (87,693) |  |  | $ | (260,953) |
Other comprehensive loss before reclassifications | — |  |  | 1,022 |  |  | (38,655) |  |  | (37,633) |
Amounts reclassified from accumulated other comprehensive loss | 5,910 |  |  | 1,518 |  |  | — |  |  | 7,428 |
Other comprehensive loss | 5,910 |  |  | 2,540 |  |  | (38,655) |  |  | (30,205) |
Balance at September 30, 2021 | $ | (162,694) |  |  | $ | (2,116) |  |  | $ | (126,348) |  |  | $ | (291,158) |

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