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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends per share	$ 0.76	$ 0.73	$ 0.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	19,030	3,275	72,130
Stock dividend, percentage	5.00%	5.00%	5.00%
Stock dividends	225,650	218,589	207,794
Treasury shares	106,894
Percentage Of stocks dividend	5.00%	5.00%	5.00%

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Number of share options (or share units) exercised during the current period.

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Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.

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