Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details

Goodwill (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Goodwill
Goodwill	$ 12,942	$ 12,942		$ 70,155
Goodwill impairment	$ 57,213	$ 57,213
Decrease in gold and silver prices since completion of transaction (as a percent)			20.00%
Goodwill
Period of operating plan		25 years
Expected results
Goodwill
Plant throughput up to which company plans to ramp up production by 2014	1,150	1,150
Weighted average cost of capital (as a percent)		21.00%
Gold \| Expected results \| Maximum
Goodwill
Metal prices used in analysis (in dollars per ounce)	35.78	35.78
Gold \| Expected results \| Minimum
Goodwill
Metal prices used in analysis (in dollars per ounce)	21.88	21.88
Silver \| Expected results \| Maximum
Goodwill
Metal prices used in analysis (in dollars per ounce)	1,879.00	1,879.00
Silver \| Expected results \| Minimum
Goodwill
Metal prices used in analysis (in dollars per ounce)	1,315.00	1,315.00
Velardena Operations \| Expected results
Goodwill
Plant throughput up to which company plans to ramp up production by 2014	850	850