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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% |  |  |  |  |  |  |

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