Stock Compensation Plans (Schedule Of SSAR Exercise Price Range, Number Of Shares, Weighted Average Exercise Price And Remaining Contractual Lives) (Details) (USD $)	6 Months Ended
Jun. 30, 2011
SSAR Number of Shares	824,635
SSARs Exercisable, Exercisable as of June 30, 2011	376,441
SSARs Exercisable, Weighted Average Exercise Price	35.40
Options available for grant at June 30	1,935,437
$21.45 - $24.51 [Member]
Range of Exercise Prices, lower limit	$ 21.45
Range of Exercise Prices, upper limit	$ 24.51
SSAR Number of Shares	262,907
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years)	4.3
SSARs Outstanding, Weighted Average Exercise Price	$ 21.68
SSARs Exercisable, Exercisable as of June 30, 2011	132,938
SSARs Exercisable, Weighted Average Exercise Price	21.99
$26.00 - $37.38 [Member]
Range of Exercise Prices, lower limit	$ 26.00
Range of Exercise Prices, upper limit	$ 37.38
SSAR Number of Shares	310,141
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years)	4.4
SSARs Outstanding, Weighted Average Exercise Price	$ 34.94
SSARs Exercisable, Exercisable as of June 30, 2011	167,891
SSARs Exercisable, Weighted Average Exercise Price	36.34
$44.55 - $66.20 [Member]
Range of Exercise Prices, lower limit	$ 44.55
Range of Exercise Prices, upper limit	$ 66.20
SSAR Number of Shares	251,587
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years)	5.4
SSARs Outstanding, Weighted Average Exercise Price	$ 54.04
SSARs Exercisable, Exercisable as of June 30, 2011	75,612
SSARs Exercisable, Weighted Average Exercise Price	56.88

Share Based Compensation Arrangement By Share Based Payment Award Shares Number

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- Definition

Share Based Compensation Awards Weighted Average Exercisable Price

+ Details

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- Definition

The difference between the maximum number of shares authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares already issued upon exercise of options or other share-based awards under the plan, and 2) shares reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(c), d(2)

+ Details

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- Definition

The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(d)

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64

+ Details

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- Definition

The ceiling 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64

+ Details

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