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Investments | 3 Months Ended
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Mar. 31, 2018
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.
| At March 31, 2018
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 6,294 |  |  | $ | — |  |  | $ | 2,837 |  |  | $ | 9,131 |
Corvus Gold Inc. | 3,582 |  |  | — |  |  | 6,844 |  |  | 10,426 |
Almaden Minerals, Ltd. | 2,067 |  |  | (727 | ) |  | — |  |  | 1,340 |
Northern Empire Resources Corp. | 4,489 |  |  | — |  |  | 2,999 |  |  | 7,488 |
Rockhaven Resources, Ltd. | 2,064 |  |  | (596 | ) |  | — |  |  | 1,468 |
Other | 1,190 |  |  | (155 | ) |  | 115 |  |  | 1,150 |
Equity securities | $ | 19,686 |  |  | $ | (1,478 | ) |  | $ | 12,795 |  |  | $ | 31,003 |
Debt Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 6,677 |  |  | $ | (363 | ) |  | $ | — |  |  | $ | 6,314 |
Equity and debt securities | $ | 26,363 |  |  | $ | (1,841 | ) |  | $ | 12,795 |  |  | $ | 37,317 |
| 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 |
The following table presents the disaggregated gain (loss) on equity securities recognized in Income (loss) from continuing operations on the Condensed Consolidated Statements of Comprehensive Income:
| Three months ended March 31,
In thousands | 2018 |  | 2017
Net gain (loss) | $ | 4,529 |  |  | $ | (1,471 | )
Less: Realized (gain) loss | 313 |  |  | 1,471 |
Unrealized gain (loss) | $ | 4,842 |  |  | $ | — |
The Company performs a quarterly assessment on its debt securities with unrealized losses to determine if the securities are other than temporarily impaired. The following table summarizes unrealized losses on 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 March 31, 2018:
| Less than twelve months |  | Twelve months or more |  | Total
In thousands | Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value
Debt securities | 363 |  | 6,314 |  |  | — |  | — |  |  | 363 |  | 6,314 |
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 March 31, 2018 and December 31, 2017, the Company held certificates of deposit and cash equivalents under these agreements of $22.1 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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