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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Other Comprehensive Income [Abstract] |  |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Changes in AOCI by component for the six months ended June 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) |  | — |  |  | 3,330 |  |  | (2,020) |  |  | 1,310 |
Less: Net realized losses reclassified to net income (b) |  | (310) |  |  | — |  |  | — |  |  | (310) |
Net current-period other comprehensive income (loss) |  | 310 |  |  | 3,330 |  |  | (2,020) |  |  | 1,620 |
Balance, June 30, 2021 |  | $ | (8,310) |  |  | $ | (250) |  |  | $ | 4,560 |  |  | $ | (4,000) |
__________________________ (a) Derivative instruments, net of income tax of approximately $1.1 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 six months ended June 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 gains (losses) arising during the period (a) |  | — |  |  | 2,300 |  |  | (6,950) |  |  | (4,650) |
Less: Net realized losses reclassified to net income (b) |  | (310) |  |  | — |  |  | — |  |  | (310) |
Net current-period other comprehensive income (loss) |  | 310 |  |  | 2,300 |  |  | (6,950) |  |  | (4,340) |
Balance, June 30, 2020 |  | $ | (9,620) |  |  | $ | 6,530 |  |  | $ | (7,250) |  |  | $ | (10,340) |
__________________________ (a) Derivative instruments, net of income tax of approximately $0.8 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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