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Consolidated Statements Of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Foreign currency translation adjustment, tax (benefit)	$ (623)	$ 281	$ (371)
Derivative financial instruments adjustment, tax (benefit)	71	(503)	111
Net gains or losses and prior service costs, tax (benefit)	(6,417)	(319)	(2,518)
Amortization of prior service costs and net gains or losses, tax	$ 2,359	$ 3,028	$ 4,234
Cash dividends declared (in usd per share)	$ 0.46	$ 0.44	$ 0.44
Stock Issued Upon Exercise of Stock Options, Tax Effect	$ 0	$ 0	$ 0

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Stock Issued Upon Exercise of Stock Options, Tax Effect

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Aggregate dividends declared during the period for each share of common stock outstanding.

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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.

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Amount of tax expense (benefit), before 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.

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