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Stock Option And Stock Award Plans (Summary Of Additional Information On Non-Vested Restricted Stock Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Shares, Outstanding, Beginning Balance	132,353	188,058	157,850
Number of Shares, Granted	144,546	147,666	95,707
Number of Shares, Vested	(52,167)	(174,145)	(54,921)
Number of Shares, Forfeited	(17,377)	(29,226)	(10,578)
Number of Shares, Outstanding, Ending Balance	207,355	132,353	188,058
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance	$ 21.19	$ 22.48	$ 22.00
Wgtd. Ave. Grant Date Fair Value/Sh., Granted	13.47	18.87	22.18
Wgtd. Ave. Grant Date Fair Value/Sh., Vested	21.56	20.57	20.73
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited	18.97	21.42	21.76
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance	$ 15.90	$ 21.19	$ 22.48
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Grant Date Fair Value, Outstanding, Beginning Balance	$ 2,805	$ 4,227	$ 3,473
Grant Date Fair Value, Granted	1,947	2,786	2,123
Grant Date Fair Value, Vested	(1,125)	(3,582)	(1,139)
Grant Date Fair Value, Forfeited	(330)	(626)	(230)
Grant Date Fair Value, Outstanding, Ending Balance	$ 3,297	$ 2,805	$ 4,227
Maximum Non Vested Restricted Stock Units Issuable Upon Satisfaction Of Certain Performance Criteria [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Shares, Outstanding, Beginning Balance	167,128	129,713	132,300
Number of Shares, Granted	136,986	144,582	59,675
Number of Shares, Vested	0	0	0
Number of Shares, Forfeited	(65,685)	(107,167)	(62,262)
Number of Shares, Outstanding, Ending Balance	238,429	167,128	129,713
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance	$ 22.04	$ 24.99	$ 23.81
Wgtd. Ave. Grant Date Fair Value/Sh., Granted	11.34	18.47	21.54
Wgtd. Ave. Grant Date Fair Value/Sh., Vested	0.00	0.00	0.00
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited	20.24	20.78	19.18
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance	$ 16.39	$ 22.04	$ 24.99
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Grant Date Fair Value, Outstanding, Beginning Balance	$ 3,684	$ 3,241	$ 3,150
Grant Date Fair Value, Granted	1,553	2,670	1,285
Grant Date Fair Value, Vested	0	0	0
Grant Date Fair Value, Forfeited	(1,329)	(2,227)	(1,194)
Grant Date Fair Value, Outstanding, Ending Balance	$ 3,908	$ 3,684	$ 3,241

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Total Fair Value

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ 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)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Publisher FASB
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)(2)(i)-(ii)
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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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