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Stock Option And Stock Award Plans (Summary Of Stock Options Outstanding) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 13.95 To 19.52 [Member]	Dec. 31, 2009 13.95 To 19.52 [Member]	Dec. 31, 2010 16.66 To 17.54 [Member]	Dec. 31, 2010 13.95 To 18.12 [Member]	Dec. 31, 2010 13.95 To 15.80 [Member]	Dec. 31, 2011 16.87 To 19.84 [Member]	Dec. 31, 2011 13.95 To 19.84 [Member]	Dec. 31, 2011 13.95 To 18.12 [Member]	Dec. 31, 2012 14.06 To 19.84 [Member]	Dec. 31, 2011 14.06 To 19.84 [Member]	Dec. 31, 2012 18.51 To 19.40 [Member]	Dec. 31, 2012 15.80 To 19.84 [Member]	Dec. 31, 2012 14.72 To 18.12 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options, Outstanding, Beginning Balance	1,121,500	1,017,275	796,175
Number of Options, Granted	182,100	235,800	316,000
Number of Options, Forfeited and Expired	(50,300)	(51,800)	(29,325)
Number of Options, Exercised	(176,600)	(79,775)	(65,575)
Number of Options, Outstanding, Ending Balance	1,076,700	1,121,500	1,017,275
Option Exercise Price/Share, Range, Minimum				$ 13.95	$ 13.95	$ 16.66	$ 13.95	$ 13.95	$ 16.87	$ 13.95	$ 13.95	$ 14.06	$ 14.06	$ 18.51	$ 15.80	$ 14.72
Option Exercise Price/Share, Range, Maximum				$ 19.52	$ 19.52	$ 17.54	$ 18.12	$ 15.80	$ 19.84	$ 19.84	$ 18.12	$ 19.84	$ 19.84	$ 19.40	$ 19.84	$ 18.12
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance	$ 17.40	$ 16.64	$ 16.29
Weighted Average Option Exercise Price/Share, Granted	$ 19.34	$ 19.79	$ 17.15
Weighted Average Option Exercise Price/Share, Forfeited and Expired	$ 19.34	$ 16.78	$ 16.37
Weighted Average Option Exercise Price/Share, Exercised	$ 16.33	$ 15.11	$ 15.04
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance	$ 17.81	$ 17.40	$ 16.64

X

- 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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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