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Earnings Per Share Narrative (Details)	Dec. 31, 2012
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount	10,000,000

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- Details

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Namespace Prefix:	us-gaap_
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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant