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Other Comprehensive Income (Notes)
 12 Months Ended
Dec. 31, 2020
Other Comprehensive Income [Abstract]  
Other Comprehensive Income Other Comprehensive Income
Changes in AOCI by component for the year ended December 31, 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)
670 (7,810)6,880 (260)
Less: Net realized losses reclassified to net income (b)
(640)— — (640)
Net current-period other comprehensive income (loss)1,310 (7,810)6,880 380 
Balance, December 31, 2020$(8,620)$(3,580)$6,580 $(5,620)
__________________________
(a) Defined benefit plans, net of income tax of $0.4 million. See Note 18, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax of $2.5 million. See Note 14, "Derivative Instruments," for further details.
(b) Defined benefit plans, net of income tax of $0.2 million. See Note 18, "Employee Benefit Plans," for additional details.
Changes in AOCI by component for the year ended December 31, 2019 are summarized as follows, net of tax (dollars in thousands):
Defined Benefit Plans Derivative InstrumentsForeign Currency TranslationTotal
Balance, December 31, 2018$(7,200)$940 $(10,590)$(16,850)
Net unrealized gains (losses) arising during the period (a)
(1,870)3,300 (2,060)(630)
Less: Net realized losses reclassified to net income (b)
(400)— (12,350)(12,750)
Net current-period other comprehensive income (loss)(1,470)3,300 10,290 12,120 
Reclassification of stranded tax effects(1,260)(10)— (1,270)
Balance, December 31, 2019$(9,930)$4,230 $(300)$(6,000)
__________________________
(a) Defined benefit plans, net of income tax of $0.5 million. See Note 18, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $1.0 million. See Note 14, "Derivative Instruments," for further details.
(b) Defined benefit plans, net of income tax of $0.1 million. See Note 18, "Employee Benefit Plans," for additional details.