Stockholders’ Equity And Stock-Based Compensation (Schedule Of Options Outstanding And Exercisable By Price Range) (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2012 $13.41 – $15.09 [Member]	Dec. 31, 2012 $15.09 – $19.69 [Member]	Dec. 31, 2012 $19.69 – $21.67 [Member]	Dec. 31, 2012 $13.41 – $21.67 [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2009 Stock Options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, Lower Limit		$ 13.41	$ 15.09	$ 19.69	$ 13.41
Range of Exercise prices, Upper Limit		$ 15.09	$ 19.69	$ 21.67	$ 21.67
Options Outstanding, Number		243,751	108,544	700,830	1,053,125	1,053,125	1,317,216	2,334,448	5,567,254
Options Outstanding, Weighted average remaining contractual life	1 year 2 months 12 days	1 year 1 month 24 days	1 year 2 months 9 days	1 year 2 months 19 days	1 year 2 months 12 days
Options Outstanding, Weighted average exercise price		$ 14.14	$ 18.30	$ 19.95	$ 18.44	$ 18.44	$ 18.07	$ 17.15	$ 17.95
Options Exercisable, Number		238,451	108,544	687,564	1,034,559	1,034,559	1,270,775	2,138,886
Options Exercisable, Weighted average exercise price		$ 14.14	$ 18.30	$ 19.95	$ 18.44	$ 18.44	$ 18.06	$ 17.07

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Name Accounting Standards Codification

-Topic 718

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-Section 50

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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