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Other Investments (Midas Gold) (Details) $ / shares in Units, $ in Thousands		1 Months Ended		12 Months Ended
	Dec. 31, 2016 shares	Mar. 31, 2015 USD ($)	Feb. 28, 2014 USD ($)	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2015 CAD / shares shares	Mar. 31, 2015 $ / shares shares	Feb. 28, 2014 CAD / shares shares	Feb. 28, 2014 $ / shares shares
Subsidiary, Sale of Stock [Line Items]
Proceeds from sale of other investments, net				$ 2,772	$ 10,560
Midas Gold Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Realized gain (loss) on other investments					$ (348)	$ 155
Midas Gold Shares [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares sold | shares							8,000,000	8,000,000	16,000,000	16,000,000
Sale of shares (dollars per share) | (per share)							CAD 0.46	$ 0.36	CAD 0.80	$ 0.73
Proceeds from sale of other investments, net		$ 2,772	$ 10,560	$ 2,772
Shares owned | shares	7,802,615			7,802,615			7,802,615	7,802,615	15,802,615	15,802,615
Holding percentage	4.40%	4.40%	11.20%

X

- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Definition

Balance held at close of period in number of shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-12C.Column B)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14.Column B)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12.Column B)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

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- Definition

The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585

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-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the cost method of accounting.

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- Definition

Represents the number of shares sold of investee stock.

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