Estimated Fair Values (Valuation Techniques) (Details)	Sep. 30, 2012 vendor price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Techniques, Number of Third Party Vendor Prices Received	4
Fair Value Measurements, Valuation Techniques, Number of Designated Third Party Pricing Vendors	4