Consolidated Statements of Stockholders' Equity (unaudited) (Parentheticals) - $ / shares shares in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Consolidated Statements of Stockholders' Equity (unaudited)
Shares issued under the dividend reinvestment plan (in shares)	6,275	(5,864)
Purchase of treasury stock (in shares)	179,620
Stock awards granted and distributed (in shares)	90,657	(76,274)
Stock awards forfeited (in shares)	585
Repurchase of surrendered stock from vesting of stock plans	31,225	(24,132)
Cash dividend declared (in dollars per share)	$ 0.24	$ 0.23

Number of repurchase of surrendered stock from vesting of stock plans.

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

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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Number of shares (or other type of equity) forfeited during the period.

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

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Number of shares that have been repurchased during the period and are being held in treasury.

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