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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2016
Accounting Policies [Abstract] |
Fair Value Measurements | The following table represents the fair value hierarchy based upon three levels of inputs, of which Levels 1 and 2 are considered observable and Level 3 is unobservable, for our financial assets and liabilities measured at fair value (in thousands):
|  | September 30, 2016 |  |  | December 31, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 22,253 |  |  | $ | — |  |  | $ | 22,253 |  |  | $ | 35,730 |  |  | $ | — |  |  | $ | 35,730 |
Commercial paper |  | — |  |  |  | 20,492 |  |  | 20,492 |  |  | — |  |  |  | 17,245 |  |  |  | 17,245 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | — |  |  |  | 83,978 |  |  |  | 83,978 |  |  | — |  |  |  | 77,898 |  |  |  | 77,898 |
Corporate equity securities |  |  | — |  |  |  | 2,476 |  |  |  | 2,476 |  |  | — |  |  | — |  |  | — |
Municipal bonds |  | — |  |  |  | 1,410 |  |  |  | 1,410 |  |  | — |  |  |  | 2,763 |  |  |  | 2,763 |
U.S. government agency bonds |  | — |  |  |  | 26,540 |  |  |  | 26,540 |  |  | — |  |  |  | 16,201 |  |  |  | 16,201 |
Asset-backed securities |  | — |  |  |  | 11,513 |  |  |  | 11,513 |  |  | — |  |  |  | 11,443 |  |  |  | 11,443 |
Total |  | $ | 22,253 |  |  | $ | 146,409 |  |  | $ | 168,662 |  |  | $ | 35,730 |  |  | $ | 125,550 |  |  | $ | 161,280 |
Carrying Value (Par Value for Convertible Debt) and Estimated Fair Value of Debt | We have chosen not to measure our debt at fair value, with changes recognized in earnings each reporting period. The following table indicates the carrying value (par value for convertible debt) and estimated fair value of our debt as of the indicated periods (in thousands):
|  | September 30, 2016 |  |  | December 31, 2015 |
|  | Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
|  | Value |  |  | Value |  |  | Value |  |  | Value |
Credit agreement (carrying value including current maturities) |  | $ | 136,875 |  |  | $ | 136,875 |  |  | $ | 142,500 |  |  | $ | 142,500 |
2010 Convertible debt |  |  | 34,732 |  |  |  | 63,990 |  |  |  | 150,000 |  |  |  | 237,900 |
2016 Convertible debt |  |  | 230,000 |  |  |  | 250,988 |  |  | — |  |  | — |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + 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=66048111&loc=d3e19190-110258 + Details
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