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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Prior service credit (cost) arising during the period, income tax expense (benefit)	$ (16)	$ (257)	$ (91)
Amortization of prior service cost (credit) included in net periodic benefit cost (income), income tax expense (benefit)	(680)	(681)	(720)
Actuarial net gain (loss) arising during the period, income tax expense (benefit)	(5,852)	5,952	(6,976)
Amortization of actuarial net loss (gain) included in net periodic benefit cost (income), income tax expense (benefit)	1,460	901	1,381
Foreign currency translation adjustments, income tax expense (benefit)	$ (636)	$ (181)	$ (535)

X

- Definition

Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

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Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

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Amount of tax (expense) benefit for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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