Shareholders' Equity (Summary Of Outstanding Stock Options Issued Under All Plans) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified					12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2011 $4.58 To $10.97 [Member]	Dec. 31, 2011 $11.26 To $12.87 [Member]	Dec. 31, 2011 $13.34 To $19.31 [Member]	Dec. 31, 2011 $20.03 To $28.43 [Member]
Options Outstanding, Range of Exercise Prices, minimum					$ 4.58	$ 11.26	$ 13.34	$ 20.03
Options Outstanding, Range of Exercise Prices, maximum					$ 10.97	$ 12.87	$ 19.31	$ 28.43
Options Outstanding	2,151	2,067	1,763	1,819	599	560	602	390
Options Outstanding, Weighted Avg. Remaining Contractual Life (Years)	5.6				7.0	7.9	3.4	3.4
Options Outstanding, Weighted Avg. Exercise Price	$ 14.48	$ 14.82	$ 15.05	$ 15.66	$ 8.76	$ 12.11	$ 16.13	$ 24.14
Options Exercisable	1,334	1,217	1,071		255	188	502	389
Options Exercisable, Weighted Avg. Exercise Price	$ 16.13	$ 16.65	$ 15.90		$ 6.51	$ 11.95	$ 16.34	$ 24.14

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 Statement of Financial Accounting Standard (FAS)

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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.

+ References

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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.

+ References

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Number 123R

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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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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