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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Other Comprehensive Income [Abstract] |  |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Changes in AOCI by component for the three months ended March 31, 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) |  | — |  |  | 1,560 |  |  | (4,040) |  |  | (2,480) |
Less: Net realized losses reclassified to net income (b) |  | (240) |  |  | — |  |  | — |  |  | (240) |
Net current-period other comprehensive income (loss) |  | 240 |  |  | 1,560 |  |  | (4,040) |  |  | (2,240) |
Balance, March 31, 2022 |  | $ | (4,590) |  |  | $ | 7,470 |  |  | $ | (4,890) |  |  | $ | (2,010) |
__________________________ (a) Derivative instruments, net of income tax of approximately $0.5 million. See Note 11, "Derivative Instruments," for further details. (b) Defined benefit plans, net of income tax of approximately $0.1 million. See Note 18, "Defined Benefit Plans," for further details. | Changes in AOCI by component for the three months ended March 31, 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) |  | — |  |  | 3,900 |  |  | (3,420) |  |  | 480 |
Less: Net realized losses reclassified to net income |  | (150) |  |  | — |  |  | — |  |  | (150) |
Net current-period other comprehensive income (loss) |  | 150 |  |  | 3,900 |  |  | (3,420) |  |  | 630 |
Balance, March 31, 2021 |  | $ | (8,470) |  |  | $ | 320 |  |  | $ | 3,160 |  |  | $ | (4,990) |
__________________________ (a) Derivative instruments, net of income tax of approximately $1.3 million. See Note 11, "Derivative Instruments," for further details.

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