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Investments | 6 Months Ended
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Jun. 30, 2014
Investment in Marketable Securities [Abstract] |
INVESTMENTS | INVESTMENTS The Company invests part of its cash balances in a managed portfolio of liquid investments including highly-rated corporate bonds which are classified as short-term investments. The Company also invests in marketable 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).
(in thousands) | At June 30, 2014
| Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Short-term investments | $ | 47,661 |  |  | $ | (31 | ) |  | $ | 12 |  |  | $ | 47,642 |
Marketable equity securities | 13,972 |  |  | (677 | ) |  | 466 |  |  | 13,761 |
(in thousands) | At December 31, 2013
| Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Marketable equity securities | $ | 17,649 |  |  | $ | (3,300 | ) |  | $ | 172 |  |  | $ | 14,521 |
The following table summarizes the gross unrealized losses on investment 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 June 30, 2014 (in thousands):
| Less than twelve months |  | Twelve months or more |  | Total
| Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value
Short-term investments | $ | (31 | ) | $ | 29,090 |  |  | $ | — |  | $ | — |  |  | $ | (31 | ) | $ | 29,090 |
Marketable equity securities | $ | — |  | $ | — |  |  | $ | (677 | ) | $ | 1,399 |  |  | $ | (677 | ) | $ | 1,399 |
The Company recognized net of tax unrealized losses of $0.8 million and $7.5 million in the three months ended June 30, 2014 and 2013, respectively, and $0.4 million and $11.1 million in the six months ended June 30, 2014 and 2013, respectively, in Other comprehensive income (loss). The Company performs a quarterly assessment on each of its marketable securities with unrealized losses to determine if the security is other than temporarily impaired. The Company recorded other-than-temporary impairment losses of $0.9 million and $17.2 million in the three months ended June 30, 2014 and 2013, respectively, and $3.5 million and $17.2 million in the six months ended June 30, 2014 and 2013, respectively.

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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 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: 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=6871852&loc=d3e26626-111562 Reference 3: 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 4: 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 Reference 5: 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 6: 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 + Details
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