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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fixed Income | Restricted Investment |  |
Fair Value |  |
Investments at fair value | $ 23,300 | $ 19,600
Money market funds | Cash and Cash Equivalents |  |
Fair Value |  |
Investments at fair value | 508,400 | 391,200
Money market funds | Restricted Investment |  |
Fair Value |  |
Investments at fair value | 400 | 300
Mutual funds, equity and alternative investments | Investments |  |
Fair Value |  |
Investments at fair value | 41,000 | 36,100
Money market and mutual funds | Other Non current Assets |  |
Fair Value |  |
Investments at fair value | 100 | 500
Ardellis Insurance Ltd. |  |
Fair Value |  |
Total Fair Value | 60,334 | 55,642
Estimate of Fair Value Measurement | Recurring |  |
Fair Value |  |
Investments at fair value | 573,181 | 447,666
Estimate of Fair Value Measurement | Recurring | Fixed Income |  |
Fair Value |  |
Investments at fair value | 22,928 | 19,286
Estimate of Fair Value Measurement | Recurring | Money market funds |  |
Fair Value |  |
Investments at fair value | 508,804 | 391,505
Estimate of Fair Value Measurement | Recurring | Treasury securities |  |
Fair Value |  |
Investments at fair value | 344 | 343
Estimate of Fair Value Measurement | Recurring | Equity |  |
Fair Value |  |
Investments at fair value | 18,755 | 17,337
Estimate of Fair Value Measurement | Recurring | Alternative Investments |  |
Fair Value |  |
Investments at fair value | 4,184 | 4,102
Estimate of Fair Value Measurement | Recurring | Mutual Fund |  |
Fair Value |  |
Investments at fair value | 18,166 | 15,093
Estimate of Fair Value Measurement | Recurring | Domestic stock |  |
Fair Value |  |
Investments at fair value | 12,048 | 13,067
Estimate of Fair Value Measurement | Recurring | International stock funds |  |
Fair Value |  |
Investments at fair value | 467 | 1,414
Estimate of Fair Value Measurement | Recurring | Target funds |  |
Fair Value |  |
Investments at fair value | 8 | 8
Estimate of Fair Value Measurement | Recurring | Bond funds |  |
Fair Value |  |
Investments at fair value | 5,158 | 130
Estimate of Fair Value Measurement | Recurring | Alternative funds |  |
Fair Value |  |
Investments at fair value | 485 | 474
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) |  |
Fair Value |  |
Investments at fair value | 534,943 | 425,586
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income |  |
Fair Value |  |
Investments at fair value | 4,768 | 2,594
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds |  |
Fair Value |  |
Investments at fair value | 496,910 | 390,219
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Treasury securities |  |
Fair Value |  |
Investments at fair value | 344 | 343
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Equity |  |
Fair Value |  |
Investments at fair value | 14,755 | 17,337
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual Fund |  |
Fair Value |  |
Investments at fair value | 18,166 | 15,093
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock |  |
Fair Value |  |
Investments at fair value | 12,048 | 13,067
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds |  |
Fair Value |  |
Investments at fair value | 467 | 1,414
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds |  |
Fair Value |  |
Investments at fair value | 8 | 8
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds |  |
Fair Value |  |
Investments at fair value | 5,158 | 130
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Alternative funds |  |
Fair Value |  |
Investments at fair value | 485 | 474
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) |  |
Fair Value |  |
Investments at fair value | 30,054 | 17,978
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income |  |
Fair Value |  |
Investments at fair value | 18,160 | 16,692
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds |  |
Fair Value |  |
Investments at fair value | 11,894 | 1,286
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) |  |
Fair Value |  |
Investments at fair value | 8,184 | 4,102
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Equity |  |
Fair Value |  |
Investments at fair value | 4,000 |
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Alternative Investments |  |
Fair Value |  |
Investments at fair value | $ 4,184 | $ 4,102

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