Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Net investment income									$ 417,202	$ 555,492	$ 349,077
Total revenues	$ 223,537	$ 202,702	$ 216,015	$ 52,488	$ 235,428	$ 173,166	$ 192,685	$ 217,909	694,742	819,188	551,599
Expenses:
Other operating expenses									104,584	104,558	93,969
Total expenses									582,674	654,032	410,092
Earnings before Federal income taxes									112,068	165,156	141,507
Federal income taxes/(benefit)									19,756	33,540	24,749
Net earnings	$ 35,135	$ 10,825	$ 48,413	$ (2,062)	$ 37,733	$ 19,989	$ 33,696	$ 40,198	92,312	131,616	116,758
The Company
Revenues:
Dividend income from subsidiaries									1,395	36,000	5,957
Net investment income									9	0	0
Total revenues									1,404	36,000	5,957
Expenses:
Other operating expenses									3,322	5,358	2,617
Total expenses									3,322	5,358	2,617
Earnings before Federal income taxes									(1,918)	30,642	3,340
Federal income taxes/(benefit)									(2,212)	(1,739)	(717)
Earnings before equity in earnings of affiliates									294	32,381	4,057
Equity in earnings of affiliates									92,018	99,235	112,701
Net earnings									$ 92,312	$ 131,616	$ 116,758