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Consolidated Condensed Statements of Shareholders' Equity (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Statement Of Stockholders Equity [Abstract] |  |  |  |
Tax effect on employee benefit funded status adjustment | $ 4 | $ 3,080 | $ 133 | $ 4,994
Cash dividends (in dollars per share) | $ 0.17 | $ 0.15 | $ 0.47 | $ 0.41
Issuance of treasury stock (in shares) | 21 | 9 | 49 | 39

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