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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Notes) | 3 Months Ended
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Mar. 31, 2021
Other Comprehensive Income [Abstract] |
Comprehensive Income (Loss) Note [Text Block] | Other Comprehensive Income (Loss) 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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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