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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract] |  |
Marketable Securities |  | Investments in available-for-sale securities were classified as follows:
| September 30, 2014 |  | December 31, 2013
Current | $ | — |  |  | $ | 239,388 |
Non-current | 21,066 |  |  | — |
Total available-for-sale securities | $ | 21,066 |  |  | $ | 239,388 |
Available-for-sale Securities | The cost, gross unrealized gains, gross unrealized losses and fair value of the Company’s available-for-sale securities were as follows:
|  | September 30, 2014
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Equity securities |  | $ | 15,044 |  |  | $ | 6,022 |  |  | $ | — |  |  | $ | 21,066 |
Total available-for-sale securities |  | $ | 15,044 |  |  | $ | 6,022 |  |  | $ | — |  |  | $ | 21,066 |
|  | December 31, 2013
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses (1) |  | Fair Value
Debt securities |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 108,300 |  |  | $ | 340 |  |  | $ | (69 | ) |  | $ | 108,571 |
U.S. government debt (2) |  | 106,335 |  |  | 60 |  |  | (79 | ) |  | 106,316 |
Asset-backed securities |  | 24,478 |  |  | 34 |  |  | (11 | ) |  | 24,501 |
Total available-for-sale securities |  | $ | 239,113 |  |  | $ | 434 |  |  | $ | (159 | ) |  | $ | 239,388 |
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(1) | All unrealized loss positions were held at a loss for less than 12 months.
(2) | U.S. Treasury obligations, U.S. government agency obligations and U.S government agency mortgage-backed securities.
Schedule of Realized Gain (Loss) |
|  | Nine Months Ended September 30,
|  | 2014
Proceeds from sales and maturities of securities |  | $ | 342,045 |
Gross realized gains |  | $ | 1,311 |
Gross realized losses |  | $ | (99 | )

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + 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 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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