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Investments - Gains and Proceeds (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments |  |  |
Realized gain on sale of investments | $ 0 | $ 0 |
Realized loss on sale of investments | 0 | 0 |
Proceeds from sale of available-for-sale debt securities | 0 | 53,900 |
Maturities of investments - debt securities | 79,000 | 92,000 | $ 117,000
Purchases of available-for-sale securities | $ 37,400 | $ 97,100 |

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- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-11 + Details
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