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