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Other Investments (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		138 Months Ended		1 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2012 Midas Gold Corp [Member]	Apr. 30, 2011 Midas Gold Corp [Member]	Jun. 30, 2013 Midas Gold Corp [Member]	Jun. 30, 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)	81,788,835		81,788,835		81,788,835	81,563,498					31,802,615
Fair value of shares received									$ 22,167	$ 22,167
Deferred Income Tax Expense (Benefit)	(4,411)	(13,210)	(15,374)	(16,201)	1				6,806	17,371
Unrealized gain/ (loss) on long-term investments	(18,541)	(34,951)	(47,322)	(42,316)	(60,338)				18,541	47,322
Number of Shares Acquired								1,400,000
Purchase Price of Private Placement								$ 3,632
Sale of Stock, Percentage of Ownership after Transaction							27.70%

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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