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Income Tax (Narrative) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Dec. 31, 2007
Income Tax Disclosure [Abstract] |  |  |  |  |
Cumulative Tax Benefit Adjustment | $ 30,700,000 |  |  |  |
Unrecorded Tax Benefit Adjustment Impact By Year |  | $ 12,000,000 | $ 9,000,000 | $ 6,000,000 | $ 3,000,000

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- Definition The cumulative tax benefit adjustment related to a decrease in the Canadian federal rate. No restatement was deemed necessary due to materiality of the adjustment on any particular accounting period. + References No definition available. + Details
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- Definition The impact of the Cumulative Tax Benefit Adjustment on a particular period. This does not represent a restatement of prior periods but rather the amount of the cumulative adjustment that would have been recorded in the periods affected, even though not material, had it been properly recorded. + References No definition available. + Details
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- Details
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