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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Number of Options |  |  |
Number of Options, Outstanding, Beginning Balance | 881,513 | 1,164,120 | 1,046,800
Number of Options, Granted | 0 | 0 | 181,476
Number of Options, Forfeited and Expired | (246,394) | (60,207) | (22,581)
Number of Options, Exercised | (134,200) | (222,400) | (41,575)
Number of Options, Outstanding, Ending Balance | 500,919 | 881,513 | 1,164,120
Weighted Average |  |  |
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance | $ 20.22 | $ 19.59 | $ 19.06
Weighted Average Option Exercise Price/Share, Granted | 0.00 | 0.00 | 22.41
Weighted Average Option Exercise Price/Share, Forfeited and Expired | 18.90 | 22.30 | 21.42
Weighted Average Option Exercise Price/Share, Exercised | 17.23 | 16.34 | 17.55
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance | 21.67 | 20.22 | 19.59
Minimum |  |  |
Option Exercise Price/Share Range |  |  |
Exercise Price, Outstanding, Beginning Balance | 17.13 | 14.06 | 14.06
Exercise Price, Granted | 0 | 0 | 19.84
Exercise Price, Forfeited and Expired | 17.13 | 17.13 | 15.8
Exercise Price, Exercised | 17.13 | 14.06 | 15.8
Exercise Price, Outstanding, Ending Balance | 17.13 | 17.13 | 14.06
Maximum |  |  |
Option Exercise Price/Share Range |  |  |
Exercise Price, Outstanding, Beginning Balance | 30.01 | 30.01 | 30.01
Exercise Price, Granted | 0 | 0 | 22.49
Exercise Price, Forfeited and Expired | 30.01 | 30.01 | 24.84
Exercise Price, Exercised | 19.84 | 19.84 | 19.84
Exercise Price, Outstanding, Ending Balance | $ 30.01 | $ 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=6415400&loc=d3e5070-113901 + Details
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