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Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Options |  |  |  |
Options Outstanding, beginning balance | 86,613 | 95,015 | 167,554 |
Options, Granted | 17,631 | 24,348 | 12,961 |
Options, Exercised | (16,639) | (32,750) | (81,500) |
Options, Forfeited | 0 | 0 | (4,000) |
Options Outstanding, ending balance | 87,605 | 86,613 | 95,015 |
Weighted-Average Exercise Price |  |  |  |
Weighted-Average Exercise Price, Outstanding, beginning balance | $ 41.08 | $ 38.38 | $ 36.74 |
Weighted-Average Exercise Price, Granted | 66.32 | 43.73 | 46.41 |
Weighted-Average Exercise Price, Exercised | 35.91 | 35.28 | 36.63 |
Weighted-Average Exercise Price, Forfeited | 0.00 | 0.00 | 31.66 |
Weighted-Average Exercise Price, Outstanding, ending balance | $ 47.15 | $ 41.08 | $ 38.38 |
Options, Exercisable at end of year | 7,887 | 3,000 | 19,750 |
Weighted-Average Exercise Price, Exercisable at end of year | $ 37.37 | $ 29.45 | $ 34.54 |
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares | 79,718 | 83,613 | 75,265 | 77,804
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 17,631 | 24,348 | 12,961 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares | 21,526 | 16,000 | 15,500 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares | 0 | 0 | 0 |
Weighted-Average Exercise Price |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value | $ 48.08 | $ 41.47 | $ 39.38 | $ 36.76
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | 66.32 | 43.73 | 46.41 |
Weighted-Average Exercise Price, Vested during the year | 37.31 | 35.09 | 32.09 |
Weighted-Average Exercise Price, Forfeited during the year | $ 0.00 | $ 0.00 | $ 0 |
Proceeds from stock option exercises | $ 0.6 | $ 1.2 | $ 3.0 |
Intrinsic value of stock options exercised | 0.5 | 0.6 | 0.9 |
Stock-based compensation expense associated with stock options | 0.2 | 0.2 | 0.2 |
Income tax benefit recognized related to stock-based compensation | 0.1 | $ 0.1 | $ 0.1 |
Unrecognized stock-based compensation expense | $ 0.4 |  |  |
Weighted average period in which the above amount is expected to be recognized | 2 years 7 months |  |  |

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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