Investments - Schedule of Changes in Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Beginning Balance	$ 496,879	$ 528,447	$ 705,193
Included in realized gains / losses	740	0	0
Included in other comprehensive income	(3,663)	(3,689)	(105,156)
Acquisitions	23,748	0	0
Sales	0	0	0
Amortization	4,765	4,724	4,526
Other	(50,553)	(32,603)	(76,116)
Transfers into Level 3	2,198	0	0
Transfers out of Level 3	0	0	0
Ending Balance	$ 474,114	$ 496,879	$ 528,447
Percent of total fixed maturities	100.00%	100.00%
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized gains (losses)	Realized gains (losses)	Realized gains (losses)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Attributable to Parent Company	Attributable to Parent Company	Attributable to Parent Company
Asset- backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Beginning Balance	$ 0	$ 0	$ 0
Included in realized gains / losses			0
Included in other comprehensive income			0
Acquisitions			0
Sales			0
Amortization			0
Other			0
Transfers into Level 3			0
Transfers out of Level 3			0
Ending Balance	11,183	0	0
Collateralized debt obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Beginning Balance	42,146	50,364	63,505
Included in realized gains / losses			0
Included in other comprehensive income			(13,771)
Acquisitions			0
Sales			0
Amortization			4,519
Other			(3,889)
Transfers into Level 3			0
Transfers out of Level 3			0
Ending Balance	42,866	42,146	50,364
Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Beginning Balance	454,733	478,083	641,688
Included in realized gains / losses			0
Included in other comprehensive income			(91,385)
Acquisitions			0
Sales			0
Amortization			7
Other			(72,227)
Transfers into Level 3			0
Transfers out of Level 3			0
Ending Balance	$ 420,065	$ 454,733	$ 478,083
Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Percent of total fixed maturities	3.00%	3.00%
Significant Unobservable Inputs (Level 3) | Asset- backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Included in realized gains / losses	$ 0	$ 0
Included in other comprehensive income	37	0
Acquisitions	8,948	0
Sales	0	0
Amortization	0	0
Other	0	0
Transfers into Level 3	2,198	0
Transfers out of Level 3	0	0
Significant Unobservable Inputs (Level 3) | Collateralized debt obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Included in realized gains / losses	0	0
Included in other comprehensive income	907	(8,230)
Acquisitions	0	0
Sales	0	0
Amortization	4,548	4,569
Other	(4,735)	(4,557)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Significant Unobservable Inputs (Level 3) | Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Included in realized gains / losses	740	0
Included in other comprehensive income	(4,607)	4,541
Acquisitions	14,800	0
Sales	0	0
Amortization	217	155
Other	(45,818)	(28,046)
Transfers into Level 3	0	0
Transfers out of Level 3	$ 0	$ 0