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Concentration of Credit Risk and Fair Value of Financial Assets and Liabilities (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Concentration Risk [Line Items]
Concentration Risk, Additional Characteristic	three	three
Concentration Risk, Percentage	95.00%	97.00%

For an entity that discloses a concentration risk as a percentage of some financial balance or benchmark, this item identifies a second characteristic of the concentration. For example, "Europe" is the second characteristic in the phrase: "net assets in Europe are 70% of total net assets".

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