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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
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, 2021 are summarized as follows, net of tax (dollars in thousands):
|  | Defined Benefit Plans |  | Derivative Instruments |  | Foreign Currency Translation |  | Total
Balance, December 31, 2020 |  | $ | (8,620) |  |  | $ | (3,580) |  |  | $ | 6,580 |  |  | $ | (5,620) |
Net unrealized gains (losses) arising during the period (a) |  | — |  |  | 7,210 |  |  | (6,570) |  |  | 640 |
Less: Net realized losses reclassified to net income (b) |  | (470) |  |  | — |  |  | — |  |  | (470) |
Net current-period other comprehensive income (loss) |  | 470 |  |  | 7,210 |  |  | (6,570) |  |  | 1,110 |
Balance, September 30, 2021 |  | $ | (8,150) |  |  | $ | 3,630 |  |  | $ | 10 |  |  | $ | (4,510) |
__________________________ (a) Derivative instruments, net of income tax of approximately $2.4 million. See Note 10, "Derivative Instruments," for further details. (b) Defined benefit plans, net of income tax of approximately $0.1 million. See Note 17, "Defined Benefit Plans," for further details. | Changes in AOCI by component for the nine months ended September 30, 2020 are summarized as follows, net of tax (dollars in thousands):
|  | Defined Benefit Plans |  | Derivative Instruments |  | Foreign Currency Translation |  | Total
Balance, December 31, 2019 |  | $ | (9,930) |  |  | $ | 4,230 |  |  | $ | (300) |  |  | $ | (6,000) |
Net unrealized losses arising during the period (a) |  | — |  |  | (2,280) |  |  | (1,210) |  |  | (3,490) |
Less: Net realized losses reclassified to net income (b) |  | (470) |  |  | — |  |  | — |  |  | (470) |
Net current-period other comprehensive income (loss) |  | 470 |  |  | (2,280) |  |  | (1,210) |  |  | (3,020) |
Balance, September 30, 2020 |  | $ | (9,460) |  |  | $ | 1,950 |  |  | $ | (1,510) |  |  | $ | (9,020) |
__________________________ (a) Derivative instruments, net of income tax of approximately $0.7 million. See Note 10, "Derivative Instruments," for further details. (b) Defined benefit plans, net of income tax of approximately $0.1 million. See Note 17, "Defined Benefit Plans," for further details.

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