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v3.23.1

Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2023
Fair Value Disclosures [Abstract] |
Summary of Investments | Investments consist of the following as of March 31, 2023 and December 31, 2022 (dollars in thousands):
|  | March 31, 2023 |
|  |  |  |  | Gross Unrealized |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 3,005 |  |  | $ | - |  |  | $ | (8 | ) |  | $ | 2,997 |
Non-governmental debt securities |  |  | 216,958 |  |  |  | 53 |  |  |  | (2,255 | ) |  |  | 214,756 |
Treasury and federal agencies |  |  | 205,023 |  |  |  | 43 |  |  |  | (1,876 | ) |  |  | 203,190 |
Total short-term investments (available for sale) |  | $ | 424,986 |  |  | $ | 96 |  |  | $ | (4,139 | ) |  | $ | 420,943 |
|  | December 31, 2022 |
|  |  |  |  | Gross Unrealized |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 3,016 |  |  | $ | - |  |  | $ | (22 | ) |  | $ | 2,994 |
Non-governmental debt securities |  |  | 222,575 |  |  |  | 37 |  |  |  | (2,880 | ) |  |  | 219,732 |
Treasury and federal agencies |  |  | 179,068 |  |  |  | 6 |  |  |  | (2,485 | ) |  |  | 176,589 |
Total short-term investments (available for sale) |  | $ | 404,659 |  |  | $ | 43 |  |  | $ | (5,387 | ) |  | $ | 399,315 |
Schedule of Maintenance Fee Payment to our equity affiliate | We make periodic operating maintenance payments to our equity affiliate. The total fees recorded during the quarters ended March 31, 2023 and 2022 were as follows (dollars in thousands):
| Maintenance Fee Payments |
For the quarter ended March 31, 2023 | $ | 431 |
For the quarter ended March 31, 2022 | $ | 433 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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