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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Summary of Fair Value Assets Measured on Recurring Basis | The fair value information related to these assets is summarized in the following tables:
|  |  |  |  |  | Fair Value Measurements at Reporting Date Using |
(in thousands) |  | March 31, 2021 |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
Other mutual funds (2) |  |  | 3,778 |  |  |  | 3,778 |  |  |  | — |  |  |  | — |
Total assets at fair value on a recurring basis |  | $ | 3,780 |  |  | $ | 3,780 |  |  | $ | — |  |  | $ | — |
|  |  |  |  |  | Fair Value Measurements at Reporting Date Using |
(in thousands) |  | December 31, 2020 |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
Other mutual funds (2) |  |  | 3,457 |  |  |  | 3,457 |  |  |  | — |  |  |  | — |
Total assets at fair value on a recurring basis |  | $ | 3,459 |  |  | $ | 3,459 |  |  | $ | — |  |  | $ | — |
(1) | We include money market funds in “Cash and cash equivalents” in the Condensed Consolidated Balance Sheets. We classify these investments as available-for-sale and record them at fair value. There have been no realized gains or losses related to these investments and we have not experienced any redemption restrictions with respect to any of the money market mutual funds.
(2) | We include other mutual funds in “Other investments and assets” in the Condensed Consolidated Balance Sheets.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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