Schedule II Financial Information of Registrant - Parent Company Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Net investment income	$ 147,909	$ 154,037	$ 171,796
Net gains on investments and other financial instruments (includes net realized gains on investments of $20,842, $35,826 and $10,843)	15,603	60,277	51,719
Other income	3,412	3,597	3,495
Total revenues	1,329,932	1,438,617	1,526,955
Expenses
Loss on extinguishment of debt	0	0	(22,738)
Other operating expenses	323,686	280,710	306,129
Total expenses (Note B)	565,100	959,176	677,962
Pretax income	764,832	479,441	848,993
Income tax provision (benefit)	164,161	85,815	176,684
Net income	600,671	393,626	672,309
Other comprehensive income (loss), net of tax	(143,632)	153,237	171,408
Comprehensive income	457,039	546,863	843,717
Parent Company
Revenues
Net investment income	7,540	19,459	19,751
Net gains on investments and other financial instruments (includes net realized gains on investments of $20,842, $35,826 and $10,843)	980	5,682	12,863
Other income	11	101	218
Total revenues	8,531	25,242	32,832
Expenses
Loss on extinguishment of debt	0	0	22,738
Other operating expenses	3,163	2,619	0
Total expenses (Note B)	3,163	2,619	22,738
Pretax income	5,368	22,623	10,094
Income tax provision (benefit)	1,167	(3,165)	(19,997)
Equity in net income of affiliates	596,470	367,838	642,218
Net income	600,671	393,626	672,309
Other comprehensive income (loss), net of tax	(143,632)	153,237	171,408
Comprehensive income	$ 457,039	$ 546,863	$ 843,717