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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.

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No definition available.

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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.

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No definition available.

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