Fair Value Measurements (Narrative) (Details)
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12 Months Ended |
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Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value Inputs, Discount Rate | 20.00% |
Minimum [Member]
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
fair value inputs probability of payout | 89.00% |
Maximum [Member]
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
fair value inputs probability of payout | 100.00% |