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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2022
Fair Value Disclosures [Abstract] |
Summary of Investments | Investments consist of the following as of September 30, 2022 and December 31, 2021 (dollars in thousands):
|  | September 30, 2022 |
|  |  |  |  | Gross Unrealized |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 3,026 |  |  | $ | - |  |  | $ | (26 | ) |  | $ | 3,000 |
Non-governmental debt securities |  |  | 211,819 |  |  |  | - |  |  |  | (3,418 | ) |  |  | 208,401 |
Treasury and federal agencies |  |  | 167,021 |  |  |  | 3 |  |  |  | (2,554 | ) |  |  | 164,470 |
Total short-term investments (available for sale) |  | $ | 381,866 |  |  | $ | 3 |  |  | $ | (5,998 | ) |  | $ | 375,871 |
|  | December 31, 2021 |
|  |  |  |  | Gross Unrealized |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 5,028 |  |  | $ | - |  |  | $ | (1 | ) |  | $ | 5,027 |
Non-governmental debt securities |  |  | 168,623 |  |  |  | 27 |  |  |  | (184 | ) |  |  | 168,466 |
Treasury and federal agencies |  |  | 720 |  |  |  | - |  |  |  | - |  |  |  | 720 |
Total short-term investments (available for sale) |  | $ | 174,371 |  |  | $ | 27 |  |  | $ | (185 | ) |  | $ | 174,213 |
Schedule of Maintenance Fee Payment to CCKF | We make periodic operating maintenance payments to our equity affiliate. The total fees recorded during the quarters and years to date ended September 30, 2022 and 2021 were as follows (dollars in thousands):
| Maintenance Fee Payments |
For the quarter ended September 30, 2022 | $ | 374 |
For the quarter ended September 30, 2021 | $ | 442 |
For the year to date ended September 30, 2022 | $ | 1,201 |
For the year to date ended September 30, 2021 | $ | 1,301 |

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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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