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Financial Instruments | 9 Months Ended
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Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract] |
Financial Instruments | Financial Instruments Cash Equivalents The Company had $747,008 and $263,967 of held-to-maturity securities with original maturities of three months or less, primarily consisting of corporate debt securities, classified as cash equivalents at September 30, 2014 and December 31, 2013, respectively. The Company's investments in held-to-maturity securities are held at amortized cost, which approximates fair value. Available-for-Sale 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 |
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.
As of September 30, 2014 and December 31, 2013, net unrealized gains on the Company's available-for-sale securities of $3,858 and $176, respectively, net of income tax expense of $2,164 and $99, respectively, were recorded in accumulated other comprehensive income. See Note 10 for the fair value hierarchy of the Company’s available-for-sale securities. The proceeds from sales and maturities of available-for-sale securities and the gross realized gains and losses included in the consolidated statement of operations are reflected in the table below. The cost of securities sold was determined using the specific identification method. There were no sales or maturities of available-for-sale securities during the three and nine months ended September 30, 2013.
|  | 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 The entire disclosure for investments, including all tables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 6 -Section 10 -Paragraph (c) -Subparagraph (1) + Details
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