Fair Value Measurements and Derivative Instruments (Unrealized Holding Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Greater than 12 continuous months, Fair Value	$ 144,282	$ 148,098
Greater than 12 continuous months, Gross unrealized losses	30,023	29,964
Less than 12 continuous months, Fair Value	4,968	0
Less than 12 continuous months, Gross unrealized losses	21	0
Mutual funds
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Greater than 12 continuous months, Fair Value	1,724	1,715
Greater than 12 continuous months, Gross unrealized losses	189	171
Government securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Greater than 12 continuous months, Fair Value	13,733	13,486
Greater than 12 continuous months, Gross unrealized losses	5,223	5,557
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	43,265	43,895
Greater than 12 continuous months, Gross unrealized losses	5,818	5,586
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	85,560	89,002
Greater than 12 continuous months, Gross unrealized losses	18,793	18,650
Asset-backed securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Less than 12 continuous months, Fair Value	4,968	0
Less than 12 continuous months, Gross unrealized losses	$ 21	$ 0

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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