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Investments | 12 Months Ended
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Dec. 31, 2016
Investment in Marketable Securities [Abstract] |
INVESTMENTS | INVESTMENTS Equity Securities The Company makes strategic investments in equity securities of silver and gold exploration and development companies. These investments are classified as available-for-sale and are measured at fair value in the financial statements with unrealized gains and losses recorded in Other comprehensive income (loss).
| At December 31, 2016
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Kootenay Silver, Inc. | $ | 2,645 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,645 |
Silver Bull Resources, Inc. | 233 |  |  | — |  |  | 783 |  |  | 1,016 |
Other | 229 |  |  | — |  |  | 598 |  |  | 827 |
Equity securities | $ | 3,107 |  |  | $ | — |  |  | $ | 1,381 |  |  | $ | 4,488 |
| At December 31, 2015
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Paramount Gold Nevada Corp. | $ | 1,470 |  |  | $ | (1,036 | ) |  | $ | — |  |  | $ | 434 |
Northair Silver Corp. | 725 |  |  | — |  |  | 9 |  |  | 734 |
Agnico-Eagle Mines Ltd. | 420 |  |  | — |  |  | 518 |  |  | 938 |
Silver Bull Resources, Inc. | 305 |  |  | — |  |  | — |  |  | 305 |
Other | 466 |  |  | (143 | ) |  | 32 |  |  | 355 |
Equity securities | $ | 3,386 |  |  | $ | (1,179 | ) |  | $ | 559 |  |  | $ | 2,766 |
The Company performs a quarterly assessment on each of its equity securities with unrealized losses to determine if the security is other than temporarily impaired. The Company recorded pre-tax other-than-temporary impairment losses of $0.7 million, $2.3 million, and $6.6 million in the years ended December 31, 2016, 2015, and 2014, respectively, in Other, net.

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- Definition Investment in marketable securities. + References No definition available. + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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