Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue:
Revenue	$ 4,302,709	$ 4,099,887	$ 3,813,905
Net investment income	987,499	952,447	927,062
Realized gains (losses)	(76,548)	59,319	(4,371)
Other income	1,246	1,216	1,325
Total revenue	5,214,906	5,112,869	4,737,921
Benefits and expenses:
Life policyholder benefits	2,045,730	2,071,810	1,809,373
Health policyholder benefits	791,809	758,745	733,481
Other policyholder benefits	27,917	29,061	30,030
Total policyholder benefits	2,865,456	2,859,616	2,572,884
Amortization of deferred acquisition costs	624,407	603,838	575,770
Commissions, premium taxes, and non-deferred acquisition costs	374,383	331,510	304,841
Other operating expense	353,954	322,029	301,038
Interest expense	90,395	83,486	86,704
Total benefits and expenses	4,308,595	4,200,479	3,841,237
Income before income taxes	906,311	912,390	896,684
Income tax benefit (expense)	(166,607)	(167,431)	(164,911)
Net income	$ 739,704	$ 744,959	$ 731,773
Basic net income per common share (in dollars per share)	$ 7.55	$ 7.30	$ 6.90
Diluted net income per common share (in dollars per share)	$ 7.47	$ 7.22	$ 6.82
Life premium
Revenue:
Revenue	$ 3,023,296	$ 2,898,210	$ 2,672,804
Health premium
Revenue:
Revenue	1,279,412	1,201,676	1,141,097
Other premium
Revenue:
Revenue	$ 1	$ 1	$ 4