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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Dividend, per share	$ 0.76	$ 0.73	$ 0.66
Excise of stock option, shares	72,130	17,540	141,103
Stock dividend, percentage	5.00%	5.00%	5.00%
Stock dividends	207,794	193,306	183,538

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- Definition

The percentage rate used to calculate stock dividend payments.

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Number of shares of common stock issued as dividends during the period. Excludes stock splits.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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

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