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Stock Option And Stock Award Plans (Summary Of Stock Options Outstanding) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Number of Options |  |  |
Number of Options, Outstanding, Beginning Balance | 500,919 | 881,513 | 1,164,120
Number of Options, Granted | 209,551 | 0 | 0
Number of Options, Forfeited and Expired | (60,685) | (246,394) | (60,207)
Number of Options, Exercised | (41,265) | (134,200) | (222,400)
Number of Options, Outstanding, Ending Balance | 608,520 | 500,919 | 881,513
Weighted Average |  |  |
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance | $ 21.67 | $ 20.22 | $ 19.59
Weighted Average Option Exercise Price/Share, Granted | 15.65 | 0.00 | 0.00
Weighted Average Option Exercise Price/Share, Forfeited and Expired | 21.42 | 18.90 | 22.30
Weighted Average Option Exercise Price/Share, Exercised | 19.84 | 17.23 | 16.34
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance | 19.75 | 21.67 | 20.22
Minimum |  |  |
Option Exercise Price/Share Range |  |  |
Exercise Price, Outstanding, Beginning Balance | 17.13 | 17.13 | 14.06
Exercise Price, Granted | 15.65 | 0 | 0
Exercise Price, Forfeited and Expired | 17.13 | 17.13 | 17.13
Exercise Price, Exercised | 19.84 | 17.13 | 14.06
Exercise Price, Outstanding, Ending Balance | 15.65 | 17.13 | 17.13
Maximum |  |  |
Option Exercise Price/Share Range |  |  |
Exercise Price, Outstanding, Beginning Balance | 30.01 | 30.01 | 30.01
Exercise Price, Granted | 15.65 | 0 | 0
Exercise Price, Forfeited and Expired | 30.01 | 30.01 | 30.01
Exercise Price, Exercised | 19.84 | 19.84 | 19.84
Exercise Price, Outstanding, Ending Balance | $ 24.84 | $ 30.01 | $ 30.01

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- Definition For presentations that combine terminations, 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 or that expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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