SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Condensed Balance Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Investment income, net of expenses	$ 244,640	$ 214,740	$ 167,476
Total revenues	1,207,731	1,155,102	1,172,785
Expenses:
Interest expense	35,602	36,905	48,054
Loss on debt extinguishment	0	0	40,199
Total losses and expenses	239,022	252,873	82,751
Income before tax	968,709	902,229	1,090,034
Provision for income taxes	205,715	189,280	224,685
Net income	762,994	712,949	865,349
Other comprehensive income (loss), net of tax	28,119	165,230	(601,208)
Comprehensive income	791,113	878,179	264,141
Parent Company
Revenues:
Investment income, net of expenses	46,167	30,123	7,193
Net gains (losses) on investments and other financial instruments	254	(47)	(2,628)
Total revenues	46,421	30,076	4,565
Expenses:
Operating expenses	1,479	1,555	1,575
Interest expense	35,602	36,905	47,601
Loss on debt extinguishment	0	0	38,870
Total losses and expenses	37,081	38,460	88,046
Income before tax	9,340	(8,384)	(83,481)
Provision for income taxes	(772)	(1,734)	(17,851)
Equity in net income of subsidiaries	752,882	719,599	930,979
Net income	762,994	712,949	865,349
Other comprehensive income (loss), net of tax	28,119	165,230	(601,208)
Comprehensive income	$ 791,113	$ 878,179	$ 264,141