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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following table presents information about the Company’s financial instruments that are accounted for at fair value on a recurring basis at March 31, 2019 and December 31, 2018 (in thousands):
|  |  |  |  | Fair Value |
|  | Fair Value Category |  |  | March 31, 2019 |  |  | December 31, 2018 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | Level 1 |  |  | $ | 2,454 |  |  | $ | 481 |
Short-term investments |  |  | Level 2 |  |  |  | 86,223 |  |  |  | — |
Company-owned life insurance |  |  | Level 2 |  |  |  | 11,787 |  |  |  | 10,464 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | Level 3 |  |  |  | 15,069 |  |  |  | 20,039 |
(1) | Investments were measured at carrying value as of December 31, 2018. See table below.
Financial Instruments Measured At Carrying Amount | The following table presents information about the Company’s financial instruments that are not carried at fair value at March 31, 2019 and December 31, 2018 (in thousands):
|  | March 31, 2019 |  |  | December 31, 2018 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments |  | $ | — | (2) |  | $ | $ — | (2) |  |  | 21,923 |  |  |  | 21,858 |
Long-term investments |  | $ | — | (2) |  | $ | — | (2) |  |  | 69,699 |  |  |  | 69,090 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 Notes |  |  | 750,000 |  |  |  | 759,375 |  |  |  | 750,000 |  |  |  | 736,725 |
2027 Notes |  |  | 1,000,000 |  |  |  | 1,010,000 |  |  |  | 500,000 |  |  |  | 482,500 |
(2) | Investments were measured at fair value as of March 31, 2019. See table above.

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- Definition Tabular disclosure of financial instruments measured at carrying amount. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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