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Other Investments (Summary Of Financial Information For Midas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		129 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Midas Gold Corp [Member]	Jun. 30, 2011 Midas Gold Corp [Member]	Dec. 31, 2011 Midas Gold Corp [Member]
Total current assets	$ 124,211		$ 124,211		$ 124,211	$ 20,170	$ 48,543		$ 37,341
Total non-current assets	38,531		38,531		38,531	160,433	147,528		119,126
Total current liabilities	1,868		1,868		1,868	3,223	5,570		3,654
Total non-current liabilities	29,880		29,880		29,880	36,157	382		563
Total equity	130,994		130,994		130,994	141,223	190,119		152,250
Operating expense	(6,982)	(7,190)	(22,932)	59,933	(36,951)		4,794	4,331
Net loss	$ 12,269	$ 10,733	$ (29,459)	$ 54,620	$ (54,113)		$ 4,415	$ 4,378

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