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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2015
Fair Value Disclosures [Abstract] |
Schedule of Investments at Fair Value on Recurring Basis | Investments carried at fair value are categorized into one of the three categories described above and consisted of the following (in thousands):
|  | March 31, 2015 |  |  | December 31, 2014 |
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Investments held in rabbi trust |  | $ | 5,631 |  |  | $ | — |  |  | $ | 5,631 |  |  | $ | — |  |  | $ | 4,332 |  |  | $ | — |  |  | $ | 4,332 |  |  | $ | — |
Money market funds (1) |  | $ | 85,248 |  |  | $ | 85,248 |  |  |  | — |  |  |  | — |  |  | $ | 25,310 |  |  | $ | 25,310 |  |  |  | — |  |  |  | — |
Marketable securities, available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency debt securities |  | $ | 7,093 |  |  | $ | 5,068 |  |  | $ | 2,025 |  |  | $ | — |  |  | $ | 4,997 |  |  | $ | 2,980 |  |  | $ | 2,017 |  |  | $ | — |
Corporate debt securities |  |  | 14,187 |  |  |  | — |  |  |  | 14,187 |  |  |  | — |  |  |  | 7,478 |  |  |  | — |  |  |  | 7,478 |  |  |  | — |
Asset-backed securities |  |  | 4,051 |  |  |  | — |  |  |  | 4,051 |  |  |  | — |  |  |  | 2,277 |  |  |  | — |  |  |  | 2,277 |  |  |  | — |
|  | $ | 25,331 |  |  | $ | 5,068 |  |  | $ | 20,263 |  |  | $ | — |  |  | $ | 14,752 |  |  | $ | 2,980 |  |  | $ | 11,772 |  |  | $ | — |
(1) | Included in cash and cash equivalents.

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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=36462937&loc=d3e19190-110258 + Details
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