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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
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, 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. | 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 11, "Derivative Instruments," for further details.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: 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=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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