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Other, Net (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Income and Expenses [Abstract] |  |  |  |
Foreign exchange gain (loss) | $ (11,456) | $ 1,281 |  | $ (16,021)
Gain (loss) on sale of assets and investments | 11,334 | (1,037) |  | (352)
Gain on sale of the Joaquin project | 0 | 21,138 | $ 0 | 0
Gain on repurchase of the Rochester royalty obligation | 0 | 2,332 |  | 0
Gain (loss) on the sale of the Endeavor stream and other royalties | 0 | 1,036 |  | 0
Impairment of equity securities | (703) | (426) | (700) | (2,346)
Other | $ 923 | 2,319 |  | 1,052
Other, net |  | $ 26,643 | $ 98 | $ (17,667)

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- Definition Gain (loss) on the sale of the Endeavor stream and other royalties + References No definition available. + Details
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- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228 + Details
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