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Fair Value Measurements and Derivative Instruments (Unrealized Holding Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | $ 145,905 | $ 148,098
Gross unrealized losses | 30,442 | 29,964
Mutual funds |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 1,717 | 1,715
Gross unrealized losses | 182 | 171
Government securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 13,309 | 13,486
Gross unrealized losses | 5,691 | 5,557
Corporate debt securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 43,323 | 43,895
Gross unrealized losses | 5,958 | 5,586
Mortgage-backed securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 87,556 | 89,002
Gross unrealized losses | $ 18,611 | $ 18,650

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