SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Condensed Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues:
Investment income, net of expenses	$ 246,258	$ 244,640	$ 214,740
Total revenues	1,213,636	1,207,731	1,155,102
Expenses:
Interest expense	35,603	35,602	36,905
Total losses and expenses	285,099	239,022	252,873
Income before tax	928,537	968,709	902,229
Benefit from income taxes	190,190	205,715	189,280
Net income	738,347	762,994	712,949
Other comprehensive income (loss), net of tax	153,768	28,119	165,230
Comprehensive income	892,115	791,113	878,179
Parent Company
Revenues:
Investment income, net of expenses	44,748	46,167	30,123
Net realized investment gains (losses)	612	254	(47)
Total revenues	45,360	46,421	30,076
Expenses:
Operating expenses	2,402	1,479	1,555
Interest expense	35,603	35,602	36,905
Total losses and expenses	38,005	37,081	38,460
Income before tax	7,355	9,340	(8,384)
Benefit from income taxes	(9,706)	(772)	(1,734)
Equity in net income of subsidiaries	721,286	752,882	719,599
Net income	738,347	762,994	712,949
Other comprehensive income (loss), net of tax	153,768	28,119	165,230
Comprehensive income	$ 892,115	$ 791,113	$ 878,179