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Investments | 12 Months Ended
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Dec. 31, 2017
Investment in Marketable Securities [Abstract] |
INVESTMENTS | INVESTMENTS Equity and Debt Securities The Company makes strategic investments in equity and debt 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, 2017
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 6,294 |  |  | $ | — |  |  | $ | 1,354 |  |  | $ | 7,648 |
Corvus Gold Inc. | 3,582 |  |  | — |  |  | 4,518 |  |  | 8,100 |
Almaden Minerals, Ltd. | 3,125 |  |  | (235 | ) |  | — |  |  | 2,890 |
Northern Empire Resources Corp. | 4,489 |  |  | — |  |  | 1,077 |  |  | 5,566 |
Rockhaven Resources, Ltd. | 2,064 |  |  | (193 | ) |  | — |  |  | 1,871 |
Kootenay Silver, Inc. | 738 |  |  | — |  |  | 1 |  |  | 739 |
Other | 1,479 |  |  | (453 | ) |  | 405 |  |  | 1,431 |
Equity securities | $ | 21,771 |  |  | $ | (881 | ) |  | $ | 7,355 |  |  | $ | 28,245 |
Debt Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 6,677 |  |  | $ | (85 | ) |  | $ | — |  |  | $ | 6,592 |
Equity and debt securities | $ | 28,448 |  |  | $ | (966 | ) |  | $ | 7,355 |  |  | $ | 34,837 |
| 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 |
The Company performs a quarterly assessment on each of its equity and debt 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 $0.4 million, $0.7 million and $2.3 million in the years ended December 31, 2017, 2016 and 2015, in Other, net. The following table summarizes unrealized losses on equity and debt securities for which other-than-temporary impairments have not been recognized and the fair values of those securities, aggregated by the length of time the individual securities have been in a continuous unrealized loss position, at December 31, 2017:
| Less than twelve months |  | Twelve months or more |  | Total
In thousands | Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value
Equity securities | $ | 881 |  | $ | 5,662 |  |  | $ | — |  | $ | — |  |  | $ | 881 |  | $ | 5,662 |
Debt securities | 85 |  | 6,592 |  |  | — |  | — |  |  | 85 |  | 6,592 |
Restricted Assets The Company, under the terms of its self-insurance and bonding agreements with certain banks, lending institutions and regulatory agencies, is required to collateralize certain portions of its asset retirement obligations. The Company has collateralized these obligations by assigning certificates of deposit that have maturity dates ranging from three months to a year to the applicable institutions or agencies. At December 31, 2017 and December 31, 2016, the Company held certificates of deposit and cash under these agreements of $20.8 million and $17.6 million, respectively. The ultimate timing of the release of the collateralized amounts is dependent on the timing and closure of each mine and repayment of the obligation. In order to release the collateral, the Company must seek approval from certain government agencies responsible for monitoring the mine closure status. Collateral could also be released to the extent the Company is able to secure alternative financial assurance satisfactory to the regulatory agencies. The Company believes the collateral will remain in place beyond a twelve-month period and has therefore classified these investments as long-term.

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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=82896770&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=82897076&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=82896770&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=82897076&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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