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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2014
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):
|  | June 30, 2014 |  |  | December 31, 2013 |
|  | Level 1 |  |  |  | Level 2 |  |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 18,771 |  |  | $ | — |  |  | $ | 18,771 |  |  | $ | 13,761 |  |  | $ | — |  |  | $ | 13,761 |
Commercial paper |  |  | — |  |  |  | 9,649 |  |  |  | 9,649 |  |  |  | — |  |  |  | 19,629 |  |  |  | 19,629 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  | — |  |  |  | 50,892 |  |  |  | 50,892 |  |  |  | — |  |  |  | 76,786 |  |  |  | 76,786 |
Municipal bonds |  |  | — |  |  |  | 24,920 |  |  |  | 24,920 |  |  |  | — |  |  |  | 29,106 |  |  |  | 29,106 |
U.S. government agency bonds |  |  | — |  |  |  | 14,033 |  |  |  | 14,033 |  |  |  | — |  |  |  | 18,050 |  |  |  | 18,050 |
Asset-backed securities |  |  | — |  |  |  | 13,616 |  |  |  | 13,616 |  |  |  |  |  |  |  | 4,209 |  |  |  | 4,209 |
Total |  | $ | 18,771 |  |  | $ | 113,110 |  |  | $ | 131,881 |  |  | $ | 13,761 |  |  | $ | 147,780 |  |  | $ | 161,541 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contract (1) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 154 |  |  | $ | 154 |
Total |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 154 |  |  | $ | 154 |
(1) | As of December 31, 2013, the fair value of the interest rate swap contract was classified on our Balance Sheet in other current liabilities.
Carrying Value 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 and estimated fair value of our debt as of the indicated periods (in thousands):
| June 30, 2014 |  |  | December 31, 2013 |
| Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Credit Agreement (carrying value including current maturities) | $ | 127,500 |  |  | $ | 127,500 |  |  | $ | 135,000 |  |  | $ | 135,000 |
Convertible debt (par value) |  | 150,000 |  |  |  | 188,145 |  |  |  | 150,000 |  |  |  | 199,800 |

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- Definition Tabular disclosure of the carrying value and fair value of financial instruments which are not carried at fair value. + 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=25499696&loc=d3e19190-110258 + Details
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