Stock-Based Compensation (Details)	3 Months Ended
Mar. 31, 2013
Stock-Based Compensation
Vesting period, low end of range	1 year
Vesting period, high end of range	3 years
Expiration of annual grants	10 years
Retirement age eligibility for employees	55 years
Retirement eligibility for employees, minimum years of service required	5 years
Percent of stock-based compensation related to retiree-eligible population (as a percent)	32.00%

Percent of stock-based compensation related to retiree-eligible population.

No definition available.

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- Definition

The age at which employees of the entity are eligible for retirement, which combined with reaching years of service triggers expense recognition of share based compensation expense, in years.

+ References

No definition available.

+ Details

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- Definition

The number of years of service which combined with reaching eligible retirement age triggers expense recognition of share based compensation expense, in years.

+ References

No definition available.

+ Details

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- Definition

The period of time after the grant date at which share-based compensation awards expire, expressed in years.

+ References

No definition available.

+ Details

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- Definition

The vesting period for awards granted with the May 2005 annual grant and subsequent.

+ References

No definition available.

+ Details

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- Definition

The vesting period for awards under the entity's share based plans, prior to the May 2005 annual grant.

+ References

No definition available.

+ Details

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- Details

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