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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends per share	$ 0.76	$ 0.73	$ 0.69
Excise of stock option, shares	3,275	72,130	17,540
Stock dividend, percentage	5.00%	5.00%	5.00%
Stock dividends	218,589	207,794	193,306

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

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