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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Notes)
3 Months Ended
Mar. 31, 2023
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, 2023 are summarized as follows, net of tax (dollars in thousands):
Defined Benefit Plans Derivative InstrumentsForeign Currency TranslationTotal
Balance, December 31, 2022$(5,380)$15,320 $(18,560)$(8,620)
Net unrealized gains (losses) arising during the period (a)
— (1,860)5,290 3,430 
Less: Net realized losses reclassified to net income(20)— — (20)
Net current-period other comprehensive income (loss)20 (1,860)5,290 3,450 
Balance, March 31, 2023$(5,360)$13,460 $(13,270)$(5,170)
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(a)     Derivative instruments, net of income tax of $0.6 million. See Note 9, "Derivative Instruments," for further details.
Changes in AOCI by component for the three months ended March 31, 2022 are summarized as follows, net of tax (dollars in thousands):
Defined Benefit Plans Derivative InstrumentsForeign Currency TranslationTotal
Balance, December 31, 2021$(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)
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(a)     Derivative instruments, net of income tax of $0.5 million. See Note 9, "Derivative Instruments," for further details.
(b)     Defined benefit plans, net of income tax of $0.1 million. See Note 16, "Defined Benefit Plans," for further details.