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Fair Value Measurements and Derivative Instruments (Available-for-sale Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost $ 229,199 $ 247,866
Gross unrealized losses (45,328) (44,024)
Estimated fair value 183,871 203,842
Government and related securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 24,929 35,048
Gross unrealized losses (6,551) (7,018)
Estimated fair value 18,378 28,030
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 62,572 65,008
Gross unrealized losses (11,024) (10,678)
Estimated fair value 51,548 54,330
Commingled fixed income securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 1,811 1,788
Gross unrealized losses (231) (207)
Estimated fair value 1,580 1,581
Mortgage-backed / asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 139,887 146,022
Gross unrealized losses (27,522) (26,121)
Estimated fair value $ 112,365 $ 119,901