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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
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, 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) |  | — |  |  | 4,430 |  |  | (8,260 | ) |  | (3,830 | )
Less: Net realized losses reclassified to net income |  | (150 | ) |  | — |  |  | — |  |  | (150 | )
Net current-period other comprehensive income (loss) |  | 150 |  |  | 4,430 |  |  | (8,260 | ) |  | (3,680 | )
Balance, March 31, 2020 |  | $ | (9,780 | ) |  | $ | 8,660 |  |  | $ | (8,560 | ) |  | $ | (9,680 | )
__________________________
(a) | Derivative instruments, net of income tax of approximately $1.5 million. See Note 10, "Derivative Instruments," for further details.
| Changes in AOCI by component for the three months ended March 31, 2019 are summarized as follows, net of tax (dollars in thousands):
|  | Defined Benefit Plans |  | Derivative Instruments |  | Foreign Currency Translation |  | Total
Balance, December 31, 2018 |  | $ | (7,200 | ) |  | $ | 940 |  |  | $ | (10,590 | ) |  | $ | (16,850 | )
Net unrealized gains arising during the period (a) |  | — |  |  | 2,220 |  |  | 700 |  |  | 2,920 |
Less: Net realized losses reclassified to net income |  | (100 | ) |  | — |  |  | — |  |  | (100 | )
Net current-period other comprehensive income |  | 100 |  |  | 2,220 |  |  | 700 |  |  | 3,020 |
Reclassification of stranded tax effects |  | (1,260 | ) |  | (10 | ) |  | — |  |  | (1,270 | )
Balance, March 31, 2019 |  | $ | (8,360 | ) |  | $ | 3,150 |  |  | $ | (9,890 | ) |  | $ | (15,100 | )
__________________________ (a) Derivative instruments, net of income tax of approximately $0.7 million. See Note 10, "Derivative Instruments," for further details.

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- Definition Other Comprehensive [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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