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Fair Value Measurements and Derivative Instruments (Available-for-sale Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | $ 229,199 | $ 247,866
Gross unrealized losses | (45,328) | (44,024)
Estimated fair value | 183,871 | 203,842
Government and related securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 24,929 | 35,048
Gross unrealized losses | (6,551) | (7,018)
Estimated fair value | 18,378 | 28,030
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 62,572 | 65,008
Gross unrealized losses | (11,024) | (10,678)
Estimated fair value | 51,548 | 54,330
Commingled fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 1,811 | 1,788
Gross unrealized losses | (231) | (207)
Estimated fair value | 1,580 | 1,581
Mortgage-backed / asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 139,887 | 146,022
Gross unrealized losses | (27,522) | (26,121)
Estimated fair value | $ 112,365 | $ 119,901

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