Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Share-Based Compensation [Line Items]
Estimated pretax compensation expense	$ 15.2
Estimated pretax compensation expenses expiration in years	four
Volatility assumptions for estimating the fair value of stock options minimum	52.90%
Volatility assumptions for estimating the fair value of stock options maximum	53.80%
2008 Incentive Compensation Plan [Member]
Share-Based Compensation [Line Items]
Common stock subject to awards of stock options or stock appreciation rights payable in shares	1.0
Common stock subject to any other form of award	1.67
Common stock available for future share-based awards	5,900,000
Employee Stock Option [Member]
Share-Based Compensation [Line Items]
Employee stock options exercisable in percentage	25.00%
Service period in years	four
Expiration period in years	ten
Restricted Stock [Member]
Share-Based Compensation [Line Items]
Service period in years	four
Restricted stock awards exercisable in percentage	25.00%
Vesting period in years	three
Non-Employee Directors' Stock Options [Member]
Share-Based Compensation [Line Items]
Expiration period in years	ten
Scenario One [Member] \| Non-Employee Directors' Stock Options [Member]
Share-Based Compensation [Line Items]
Vesting period in years	3
Scenario Two [Member] \| Non-Employee Directors' Stock Options [Member]
Share-Based Compensation [Line Items]
Vesting period in years	4

Common stock available for future share-based awards.

No definition available.

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- Definition

Common stock subject to awards of restricted stock, restricted stock units, deferred stock, performance units, annual incentive awards and substitute awards, payable in shares.

+ References

No definition available.

+ Details

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- Definition

Common stock subject to awards of stock options or stock appreciation rights payable in shares.

+ References

No definition available.

+ Details

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- Definition

The yearly percentage that vests for employee stock option grants.

+ References

No definition available.

+ Details

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- Definition

The number of years over which estimated share-based compensation expense for all unvested share-based awards that have been granted to participants will be recognized.

+ References

No definition available.

+ Details

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- Definition

The future estimated share-based compensation expense to be recognized for all unvested share-based awards that have been granted to participants, including both stock options and shares of restricted stock.

+ References

No definition available.

+ Details

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- Definition

The yearly percentage that vests for restricted stock awards.

+ References

No definition available.

+ Details

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- Definition

The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

+ 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

-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 (a)(2)

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

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- Definition

Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

+ 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

-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 (a)(1)

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

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- Definition

Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ 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

-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 (a)(1)

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

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

+ Details

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- Definition

The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

+ Details

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