11. Share Based Compensation (Summary Of Activity In Stock Option Plans) (Details) (USD $)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Shares Held in Employee Stock Ownership Plan [Abstract]
Outstanding Options, Beginning Balance	185,410	249,700
Outstanding Options, Granted
Outstanding Options, Exercised	(3,200)	(12,000)
Outstanding Options, Forfeited		(1,750)
Outstanding Options, Expired	(2,300)	(38,900)
Outstanding Options, Ending Balance	179,910	197,050
Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 19.59	$ 18.98
Outstanding, Weighted-Average Exercise Price, Granted
Outstanding, Weighted-Average Exercise Price, Exercised	$ 4.63	$ 5.09
Outstanding, Weighted-Average Exercise Price, Forfeited		$ 19.69
Outstanding, Weighted-Average Exercise Price, Expired	$ 17.43	$ 23.79
Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 19.88	$ 18.17

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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)(4)

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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

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

+ References

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Number of options outstanding, including both vested and non-vested options.

+ References

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

+ References

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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