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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Notes)
9 Months Ended
Sep. 30, 2020
Other Comprehensive Income [Abstract]  
Comprehensive Income (Loss) Note [Text Block] Other Comprehensive Income (Loss)
Changes in AOCI by component for the nine months ended September 30, 2020 are summarized as follows, net of tax (dollars in thousands):
Defined Benefit Plans Derivative InstrumentsForeign Currency TranslationTotal
Balance, December 31, 2019$(9,930)$4,230 $(300)$(6,000)
Net unrealized gains (losses) arising during the period (a)
— (2,280)(1,210)(3,490)
Less: Net realized losses reclassified to net income (b)
(470)— — (470)
Net current-period other comprehensive income (loss)470 (2,280)(1,210)(3,020)
Balance, September 30, 2020$(9,460)$1,950 $(1,510)$(9,020)
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(a)     Derivative instruments, net of income tax of approximately $0.7 million. See Note 12, "Derivative Instruments," for further details.
(b)     Defined benefit plans, net of income tax of approximately $0.1 million. See Note 19, "Defined Benefit Plans," for further details.
Changes in AOCI by component for the nine months ended September 30, 2019 are summarized as follows, net of tax (dollars in thousands):
Defined Benefit Plans Derivative InstrumentsForeign Currency TranslationTotal
Balance, December 31, 2018$(7,200)$940 $(10,590)$(16,850)
Net unrealized gains (losses) arising during the period (a)
— 5,750 (4,380)1,370 
Less: Net realized losses reclassified to net income (b)
(300)— — (300)
Net current-period other comprehensive income (loss)300 5,750 (4,380)1,670 
Reclassification of stranded tax effects(1,260)(10)— (1,270)
Balance, September 30, 2019$(8,160)$6,680 $(14,970)$(16,450)
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(a)     Derivative instruments, net of income tax of approximately $1.8 million. See Note 12, "Derivative Instruments," for further details.
(b)     Defined benefit plans, net of income tax of approximately $0.1 million. See Note 19, "Defined Benefit Plans," for further details.