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Fair Value Measurements (Quantitative Information Level 3 Measurements ) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Estimate of Fair Value Measurement |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Long-term debt, fair value | $ 567,500 |  |  | $ 585,100 | $ 585,200 |  |  |
Level 3 | Convertible preferred securities |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Asset fair value | 15,725 | $ 15,625 | $ 15,625 | 15,625 | 20,628 | $ 15,424 | $ 15,410 | $ 16,278
Implied based on market prices | Level 3 | Convertible preferred securities | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Asset fair value | $ 15,725 |  |  | $ 15,625 | $ 20,628 |  |  |

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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