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

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Balance Type: | na
Period Type: | instant