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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Other Comprehensive Income [Abstract] |  |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Changes in AOCI by component for the nine months ended September 30, 2023 are summarized as follows, net of tax (dollars in thousands):
|  | Defined Benefit Plans |  | Derivative Instruments |  | Foreign Currency Translation |  | Total
Balance, December 31, 2022 |  | $ | (5,380) |  |  | $ | 15,320 |  |  | $ | (18,560) |  |  | $ | (8,620) |
Net unrealized gains arising during the period (a) |  | — |  |  | 630 |  |  | 1,060 |  |  | 1,690 |
Less: Net realized losses reclassified to net income (b) |  | (780) |  |  | — |  |  | — |  |  | (780) |
Net current-period other comprehensive income |  | 780 |  |  | 630 |  |  | 1,060 |  |  | 2,470 |
Balance, September 30, 2023 |  | $ | (4,600) |  |  | $ | 15,950 |  |  | $ | (17,500) |  |  | $ | (6,150) |
__________________________ (a) Derivative instruments, net of income tax of $0.2 million. See Note 9, "Derivative Instruments," for further details. (b) Defined benefit plans, net of income tax of $0.3 million. See Note 16, "Defined Benefit Plans," for further details. | Changes in AOCI by component for the nine months ended September 30, 2022 are summarized as follows, net of tax (dollars in thousands):
|  | Defined Benefit Plans |  | Derivative Instruments |  | Foreign Currency Translation |  | Total
Balance, December 31, 2021 |  | $ | (4,830) |  |  | $ | 5,910 |  |  | $ | (850) |  |  | $ | 230 |
Net unrealized gains (losses) arising during the period (a) |  | — |  |  | 18,740 |  |  | (32,950) |  |  | (14,210) |
Less: Net realized losses reclassified to net income (b) |  | (430) |  |  | — |  |  | — |  |  | (430) |
Net current-period other comprehensive income (loss) |  | 430 |  |  | 18,740 |  |  | (32,950) |  |  | (13,780) |
Balance, September 30, 2022 |  | $ | (4,400) |  |  | $ | 24,650 |  |  | $ | (33,800) |  |  | $ | (13,550) |
__________________________ (a) Derivative instruments, net of income tax of $6.3 million. See Note 9, "Derivative Instruments," for further details. (b) Defined benefit plans, net of income tax of $0.1 million. See Note 16, "Defined Benefit Plans," for further details.

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