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Share-Based Compensation (Summarized Information Of Stock Options Outstanding) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number Outstanding	3,316,000
Options Outstanding, Average Remaining Contractual Life	6.50
Options Outstanding, Weighted Average Exercise Price Per Share	$ 12.20
Options Exercisable, Number Exercisable	1,630,000
Options Exercisable, Weighted Average Exercise Price	$ 8.94
Range One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, Lower Limit	$ 2.41
Exercise Price Range, Upper Limit	$ 3.68
Options Outstanding, Number Outstanding	502,000
Options Outstanding, Average Remaining Contractual Life	1.38
Options Outstanding, Weighted Average Exercise Price Per Share	$ 3.27
Options Exercisable, Number Exercisable	502,000
Options Exercisable, Weighted Average Exercise Price	$ 3.27
Range Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range	$ 6.07
Options Outstanding, Number Outstanding	280,000
Options Outstanding, Average Remaining Contractual Life	2.74
Options Outstanding, Weighted Average Exercise Price Per Share	$ 6.07
Options Exercisable, Number Exercisable	280,000
Options Exercisable, Weighted Average Exercise Price	$ 6.07
Range Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range	$ 10.39
Options Outstanding, Number Outstanding	455,000
Options Outstanding, Average Remaining Contractual Life	6.76
Options Outstanding, Weighted Average Exercise Price Per Share	$ 10.39
Options Exercisable, Number Exercisable	239,000
Options Exercisable, Weighted Average Exercise Price	$ 10.39
Range Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, Lower Limit	$ 13.93
Exercise Price Range, Upper Limit	$ 14.31
Options Outstanding, Number Outstanding	997,000
Options Outstanding, Average Remaining Contractual Life	6.96
Options Outstanding, Weighted Average Exercise Price Per Share	$ 14.15
Options Exercisable, Number Exercisable	521,000
Options Exercisable, Weighted Average Exercise Price	$ 14.09
Range Five [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, Lower Limit	$ 16.11
Exercise Price Range, Upper Limit	$ 17.50
Options Outstanding, Number Outstanding	1,082,000
Options Outstanding, Average Remaining Contractual Life	9.32
Options Outstanding, Weighted Average Exercise Price Per Share	$ 16.88
Options Exercisable, Number Exercisable	88,000
Options Exercisable, Weighted Average Exercise Price	$ 16.11

X

- Definition

Share Based Compensation Share Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price.

+ References

No definition available.

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- Definition

Share Based Compensation Share Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term.

+ References

No definition available.

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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 vested portions of options outstanding and currently exercisable under the stock 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)

-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.



Reference 2: 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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X

- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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)(iii)

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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

-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.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)

-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.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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)(a, b)

-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.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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X

- 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

-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.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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