Schedule II - Financial Information of Registrant - Parent Company Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Net investment income	$ 195,658	$ 147,909	$ 154,037
Net gains (losses) on investments and other financial instruments (includes net realized gains (losses) on investments of $(8,278), $20,842 and $35,826) (Note 6)	(80,733)	15,603	60,277
Other income	2,454	3,412	3,597
Total revenues	1,190,726	1,329,932	1,438,617
Expenses
Other operating expenses	381,148	323,686	280,710
Total expenses (Note B)	237,947	565,100	959,176
Pretax income	952,779	764,832	479,441
Income tax provision (benefit)	209,845	164,161	85,815
Net income	742,934	600,671	393,626
Other comprehensive income (loss), net of tax	(576,892)	(143,632)	153,237
Comprehensive income	166,042	457,039	546,863
Parent Company
Revenues
Net investment income	20,584	7,540	19,459
Net gains (losses) on investments and other financial instruments (includes net realized gains (losses) on investments of $(8,278), $20,842 and $35,826) (Note 6)	(4,322)	980	5,682
Other income	78	11	101
Total revenues	16,340	8,531	25,242
Expenses
Other operating expenses	2,043	3,163	2,619
Total expenses (Note B)	2,043	3,163	2,619
Pretax income	14,297	5,368	22,623
Income tax provision (benefit)	8,148	1,167	(3,165)
Equity in net income of affiliates	736,785	596,470	367,838
Net income	742,934	600,671	393,626
Other comprehensive income (loss), net of tax	(576,892)	(143,632)	153,237
Comprehensive income	$ 166,042	$ 457,039	$ 546,863