Balance Sheet Related Information (Details 3) (As Restated [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
As Restated [Member]
Reclamation liability
Balance at beginning of the year	$ 7,980	[1]	$ 6,782	[1]
Settlement of obligations	(4,304)	[1]	(2,185)	[1]
Liabilities incurred and accretion expense	6,026	[1]	3,271	[1]
Currency translation adjustments	(446)	[1]	112	[1]
Balance at the end of the year	$ 9,256	[1]	$ 7,980	[1]

[1] Restated