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Consolidated Statements of Stockholders' Equity (unaudited) (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Consolidated Statements of Stockholders' Equity (unaudited) [Abstract] |  |  |  |
Cash dividends - per share (in dollars per share) | $ 0.28 | $ 0.27 | $ 0.56 | $ 0.54
Purchase of treasury shares (in shares) | 182,900 | 23,627 | 400,000 | 280,658
Net issuance of shares to employee benefit plans and other stock plans (in shares) | 26,983 | 53,788 | 68,394 | 106,927

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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