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Other Investments (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		135 Months Ended		1 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 Midas Gold Corp [Member]	Apr. 30, 2011 Midas Gold Corp [Member]	Mar. 31, 2013 Midas Gold Corp [Member]	Apr. 06, 2011 Midas Gold Corp [Member]
Sale of Stock, Number of Shares Issued in Transaction						30,402,615
Capital stock, shares outstanding (in shares)	81,721,960		81,721,960	81,563,498				31,802,615
Fair value of shares received							$ 40,707
Deferred Income Tax Expense (Benefit)	(10,963)	(2,991)	4,412
Unrealized gain/ (loss) on long-term investments	(28,781)	(7,365)	(41,797)				28,781
Number of Shares Acquired						1,400,000
Purchase Price of Private Placement						3,632
Income Tax Expense (Benefit), Continuing Operations							$ 10,563
Sale of Stock, Percentage of Ownership after Transaction					27.70%

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