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Fair Value Measurements and Derivative Instruments (Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | $ 183,871 | $ 203,842
Commingled fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 1,580 | 1,581
Government and related securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 18,378 | 28,030
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 51,548 | 54,330
Recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 191,667 | 201,850
Equity securities | 16,644 | 15,341
Mortgage-backed / asset-backed securities | 112,365 | 119,901
Total assets | 404,394 | 437,657
Recurring basis | Interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 4,810 | 8,425
Recurring basis | Commingled fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 5,960 | 7,322
Recurring basis | Government and related securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 21,400 | 30,488
Recurring basis | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 51,548 | 54,330
Level 1 | Recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 44,687 | 13,366
Equity securities | 0 | 0
Mortgage-backed / asset-backed securities | 0 | 0
Total assets | 54,392 | 26,436
Level 1 | Recurring basis | Interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Level 1 | Recurring basis | Commingled fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 1,580 | 1,581
Level 1 | Recurring basis | Government and related securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 8,125 | 11,489
Level 1 | Recurring basis | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Level 2 | Recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 146,980 | 188,484
Equity securities | 16,644 | 15,341
Mortgage-backed / asset-backed securities | 112,365 | 119,901
Total assets | 350,002 | 411,221
Level 2 | Recurring basis | Interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 4,810 | 8,425
Level 2 | Recurring basis | Commingled fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 4,380 | 5,741
Level 2 | Recurring basis | Government and related securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 13,275 | 18,999
Level 2 | Recurring basis | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 51,548 | 54,330
Level 3 | Recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 0 | 0
Equity securities | 0 | 0
Mortgage-backed / asset-backed securities | 0 | 0
Total assets | 0 | 0
Level 3 | Recurring basis | Interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Level 3 | Recurring basis | Commingled fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Level 3 | Recurring basis | Government and related securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Level 3 | Recurring basis | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | $ 0 | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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