Stock-Based Compensation (Details)	12 Months Ended
Dec. 31, 2012 Participants
Stock-Based Compensation
Vesting period for awards prior to May 2005 grant	1 year
Vesting period for awards after May 2005 grant	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	30.00%
Number of participants with outstanding options, restricted stock, or restricted stock units	11,564

The number of participants with outstanding options, restricted stock, or restricted stock units.

No definition available.

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- Definition

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

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No definition available.

+ Details

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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.

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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.

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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.

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No definition available.

+ Details

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- Definition

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

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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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