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Fair Value Measurements and Derivative Instruments (Unrealized Holding Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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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 | $ 182,119 | $ 199,879
Greater than 12 continuous months, Gross unrealized losses | 45,095 | 43,605
Less than 12 continuous months, Fair Value | 1,752 | 3,963
Less than 12 continuous months, Gross unrealized losses | 233 | 419
Government and related securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Greater than 12 continuous months, Fair Value | 18,378 | 28,030
Greater than 12 continuous months, Gross unrealized losses | 6,551 | 7,018
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 | 51,376 | 51,948
Greater than 12 continuous months, Gross unrealized losses | 11,022 | 10,466
Less than 12 continuous months, Fair Value | 172 | 2,382
Less than 12 continuous months, Gross unrealized losses | 2 | 212
Commingled fixed income securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Less than 12 continuous months, Fair Value | 1,580 | 1,581
Less than 12 continuous months, Gross unrealized losses | 231 | 207
Mortgage-backed / 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 | 112,365 | 119,901
Greater than 12 continuous months, Gross unrealized losses | $ 27,522 | $ 26,121

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