Fair Value Measurements and Derivative Instruments (Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	$ 196,923	$ 247,866
Gross unrealized losses	(38,944)	(44,024)
Estimated fair value	157,979	203,842
Government and related securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	21,432	35,048
Gross unrealized losses	(5,688)	(7,018)
Estimated fair value	15,744	28,030
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	50,367	65,008
Gross unrealized losses	(8,208)	(10,678)
Estimated fair value	42,159	54,330
Commingled fixed income securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	1,835	1,788
Gross unrealized losses	(223)	(207)
Estimated fair value	1,612	1,581
Mortgage-backed / asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	123,289	146,022
Gross unrealized losses	(24,825)	(26,121)
Estimated fair value	$ 98,464	$ 119,901