v2.4.0.8

Fair Value Measurements (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012
Fair Value Disclosures [Abstract] |  |
Summary of Placement in the Fair Value Hierarchy of Financial Assets that are Measured at Fair Value on a Recurring Basis | The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at September 30, 2013:
|  | Quoted prices in active markets (level 1) |  |  | Significant other observable inputs (level 2) |  |  | Significant unobservable inputs (level 3) |  |  | September 30, 2013 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities (Note 4) |  | $ | — |  |  | $ | 205,768 |  |  | $ | — |  |  | $ | 205,768 |
Commercial paper (Note 4) |  |  | — |  |  |  | 10,247 |  |  |  | — |  |  |  | 10,247 |
Certificates of deposit (Note 4) |  |  | — |  |  |  | 1,766 |  |  |  | — |  |  |  | 1,766 |
Equity securities (Note 3) |  |  | 75,754 |  |  |  | 31,813 |  |  |  | — |  |  |  | 107,567 |
|  | $ | 75,754 |  |  | $ | 249,594 |  |  | $ | — |  |  | $ | 325,348 |
The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at December 31, 2012:
|  | Quoted prices in active markets (level 1) |  |  | Significant other observable inputs (level 2) |  |  | Significant unobservable inputs (level 3) |  |  | December 31, 2012 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit (Note 4) |  | $ | — |  |  | $ | 260 |  |  | $ | — |  |  | $ | 260 |
Equity securities (Note 3) |  |  | 72,988 |  |  |  | 10,128 |  |  |  | — |  |  |  | 83,116 |
|  | $ | 72,988 |  |  | $ | 10,388 |  |  | $ | — |  |  | $ | 83,376 |
| The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at December 31, 2012:
|  | Quoted prices in active markets (level 1) |  |  | Significant other observable inputs (level 2) |  |  | Significant unobservable inputs (level 3) |  |  | December 31, 2012 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities (Note 4) |  | $ | 72,988 |  |  | $ | 10,128 |  |  | $ | — |  |  | $ | 83,116 |
|  | $ | 72,988 |  |  | $ | 10,128 |  |  | $ | — |  |  | $ | 83,116 |
The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at December 31, 2011:
|  | Quoted prices in active markets (level 1) |  |  | Significant other observable inputs (level 2) |  |  | Significant unobservable inputs (level 3) |  |  | December 31, 2011 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities (Note 4) |  | $ | 39,097 |  |  | $ | — |  |  | $ | — |  |  | $ | 39,097 |
|  | $ | 39,097 |  |  | $ | — |  |  | $ | — |  |  | $ | 39,097 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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