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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2014
Fair Value Disclosures [Abstract] |
Summary of the valuation of cash equivalents and marketable securities by pricing levels | The following table presents the financial instruments that are carried at fair value and summarizes the valuation of its cash equivalents and marketable securities by the above pricing levels as of June 30, 2014 and December 31, 2013:
| As of June 30, 2014
| Total |  | Quoted Market Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (In thousands)
Money market funds | $ | 79,522 |  |  | $ | 79,522 |  |  | $ | — |  |  | $ | — |
Corporate notes, bonds and commercial paper | 146,859 |  |  | — |  |  | 146,859 |  |  | — |
Total available-for-sale securities | $ | 226,381 |  |  | $ | 79,522 |  |  | $ | 146,859 |  |  | $ | — |
| As of December 31, 2013
| Total |  | Quoted Market Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (In thousands)
Money market funds | $ | 300,605 |  |  | $ | 300,605 |  |  | $ | — |  |  | $ | — |
Corporate notes, bonds and commercial paper | 58,492 |  |  | — |  |  | 58,492 |  |  | — |
Total available-for-sale securities | $ | 359,097 |  |  | $ | 300,605 |  |  | $ | 58,492 |  |  | $ | — |
Financial instruments that are measured and carried at cost on a nonrecurring basis | The following table presents the financial instruments that are measured on a nonrecurring basis as of June 30, 2014:
| As of June 30, 2014 |  |
(in thousands) | Carrying Value |  | Quoted market prices in active markets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |  | Impairment charges for the six months ended June 30, 2014
Investment in non-marketable security | $ | 600 |  |  | $ | — |  |  | $ | — |  |  | $ | 600 |  |  | $ | — |
Financial instruments not carried at fair value but requiring fair value disclosure | The following table presents the financial instruments that are not carried at fair value but require fair value disclosure as of June 30, 2014 and December 31, 2013:
|  | As of June 30, 2014 |  | As of December 31, 2013
(In thousands) |  | Face Value |  | Carrying Value |  | Fair Value |  | Face Value |  | Carrying Value |  | Fair Value
5% Convertible Senior Notes due 2014 (the "2014 Notes") |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 172,500 |  |  | $ | 164,047 |  |  | $ | 175,821 |
1.125% Convertible Senior Notes due 2018 (the "2018 Notes") |  | $ | 138,000 |  |  | $ | 112,316 |  |  | $ | 185,189 |  |  | $ | 138,000 |  |  | $ | 109,629 |  |  | $ | 142,427 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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