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Fair Value Of Financial Instruments (Narrative) (Details) (Fair Value, Inputs, Level 3 [Member])	9 Months Ended
	Sep. 30, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average gold price per ounce (in dollars per ounce)	1,160
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated gold production (in ounces)	650,000
Timing of commencement of commercial production	7 years
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated gold production (in ounces)	350,000
Timing of commencement of commercial production	3 years