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Consolidated Condensed Statements Of Changes In Stockholders' Equity (Parenthetical) - $ / shares | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Statement of Stockholders' Equity [Abstract] |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 3.11 | $ 2.82
Stock Issued During Period, Shares, Acquisitions | 435,457 | 0
Treasury Stock, Shares, Acquired | 50,000 | 70,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 18,800 | 9,674

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