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Fair Value Measurements and Derivative Instruments (Unrealized Holding Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Greater than 12 continuous months, Fair Value | $ 148,098 | $ 157,979
Greater than 12 continuous months, Gross unrealized losses | 29,964 | 38,944
Mutual funds |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Greater than 12 continuous months, Fair Value | 1,715 | 1,612
Greater than 12 continuous months, Gross unrealized losses | 171 | 223
Government securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Greater than 12 continuous months, Fair Value | 13,486 | 15,744
Greater than 12 continuous months, Gross unrealized losses | 5,557 | 5,688
Corporate debt securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Greater than 12 continuous months, Fair Value | 43,895 | 42,159
Greater than 12 continuous months, Gross unrealized losses | 5,586 | 8,208
Mortgage-backed securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Greater than 12 continuous months, Fair Value | 89,002 | 90,628
Greater than 12 continuous months, Gross unrealized losses | 18,650 | 24,313
Asset-backed securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Greater than 12 continuous months, Fair Value | 0 | 7,836
Greater than 12 continuous months, Gross unrealized losses | $ 0 | $ 512

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