Fair Value Measurements (Details 4) (Auction rate securities, Discounted cash flow)	6 Months Ended
Jun. 30, 2012
Minimum
Quantitative information for Level 3 Fair Value Measurements Assets
Discount rate (as a percent)	54.00%
Maximum
Quantitative information for Level 3 Fair Value Measurements Assets
Discount rate (as a percent)	64.00%
Weighted Average
Quantitative information for Level 3 Fair Value Measurements Assets
Discount rate (as a percent)	60.00%

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

No definition available.

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