Fair Value Measurements Fair Value Measurements (Details 2) (Fair Value, Inputs, Level 3 [Member])	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Price per ounce	25.00
Property, Plant and Equipment [Member] | Minimum [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	8.50%
Property, Plant and Equipment [Member] | Maximum [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	10.50%
Mining Properties [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Price per ounce	1,450
Mining Properties [Member] | Minimum [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	8.50%
Mining Properties [Member] | Maximum [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	10.50%