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Fair Value Measures and Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Schedule of fair value of financial instruments using levels of inputs | The following tables summarize our assets and liabilities measured at fair value on a recurring basis using the following levels of inputs as of December 31, 2021 and 2020, as indicated (in thousands):
| Fair Value Measurements at December 31, 2021
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Cash equivalents—Money market mutual funds | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Equity securities, at fair value | 102,529 |  |  | 174 |  |  | — |  |  | 102,355 |
Trading securities held in a "rabbi trust" (1) | 179 |  |  | 179 |  |  | — |  |  | — |
Total assets | $ | 102,708 |  |  | $ | 353 |  |  | $ | — |  |  | $ | 102,355 |
Liabilities: |  |  |  |  |  |  |
Deferred compensation accrual "rabbi trust" (2) | $ | 188 |  |  | $ | 188 |  |  | $ | — |  |  | $ | — |
Total liabilities | $ | 188 |  |  | $ | 188 |  |  | $ | — |  |  | $ | — |
| Fair Value Measurements at December 31, 2020
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Cash equivalents—Money market mutual funds | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Equity securities, at fair value | 1,127 |  |  | 1,127 |  |  | — |  |  | — |
Trading securities held in a "rabbi trust" (1) | 139 |  |  | 139 |  |  | — |  |  | — |
Total assets | $ | 1,266 |  |  | $ | 1,266 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Deferred compensation accrual "rabbi trust" (2) | $ | 148 |  |  | $ | 148 |  |  | $ | — |  |  | $ | — |
Total liabilities | $ | 148 |  |  | $ | 148 |  |  | $ | — |  |  | $ | — |
___________________________________________ (1) — Trading securities held in a rabbi trust are included in Prepaids and other current assets and Other long-term assets, net in the consolidated balance sheets. (2) — Non-qualified deferred compensation in a rabbi trust is included in Accrued liabilities and Other long-term liabilities in the consolidated balance sheets.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The activity for our Level 3 investments for the year ended December 31, 2021 is as follows:
| Amount
Level 3 investments at December 31, 2020 | $ | — |
Increase due to acquisition of Level 3 investments | 99,723 |
Increase in fair value of Level 3 investments | 2,632 |
Level 3 investments at December 31, 2021 | $ | 102,355 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=123874694&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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