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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2024
Fair Value Measurements |
Schedule of assets measured at fair value on a recurring basis | Assets measured at fair value on a recurring basis are summarized below (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements as of March 31, 2024
​ |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Marketable Securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Bonds and bond funds | ​ | $ | 628,994 | ​ | $ | — | ​ | $ | 628,994 | ​ | $ | —
Commercial paper | ​ |  | 12,191 | ​ |  | — | ​ |  | 12,191 | ​ |  | —
​ | ​ | ​ | 641,185 | ​ | ​ | — | ​ | ​ | 641,185 | ​ | ​ | —
Investments in Other Companies | ​ | ​ | 11,904 | ​ | ​ | 2,158 | ​ | ​ | — | ​ | ​ | 9,746
Cash and Cash Equivalents | ​ | ​ | 179,979 | ​ | ​ | 179,979 | ​ | ​ | — | ​ | ​ | —
Total Assets Measured at Fair Value | ​ | $ | 833,068 | ​ | $ | 182,137 | ​ | $ | 641,185 | ​ | $ | 9,746
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements as of December 31, 2023
​ | ​ | Total | ​ | Level 1 | ​ | Level 2 | ​ | Level 3
Marketable Securities |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Bonds and bond funds | ​ | $ | 677,074 | ​ | $ | — | ​ | $ | 677,074 | ​ | $ | —
Commercial paper | ​ |  | 9,872 | ​ |  | — | ​ |  | 9,872 | ​ |  | —
​ | ​ | ​ | 686,946 | ​ | ​ | — | ​ | ​ | 686,946 | ​ | ​ | —
Investments in Other Companies | ​ | ​ | 15,402 | ​ | ​ | 2,925 | ​ |  | — | ​ |  | 12,477
Cash and Cash Equivalents | ​ | ​ | 148,277 | ​ | ​ | 148,277 | ​ | ​ | — | ​ | ​ | —
Total Assets Measured at Fair Value | ​ | $ | 850,625 | ​ | $ | 151,202 | ​ | $ | 686,946 | ​ | $ | 12,477
​

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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