STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating revenue
Total operating revenue	$ 2,633,977	$ 2,536,489	$ 2,477,298
Operating expenses
Total operating expenses	2,315,880	2,198,332	2,119,959
Operating income	318,097	338,157	357,339
Investment income
Net investment income	62,177	29,753	34,059
Net realized and unrealized investment gains	4,946	6,392	6,103
Net impairment recoveries (losses) recognized in earnings	209	(3,278)	(195)
Total investment income	67,332	32,867	39,967
Interest expense, net	4,132	731	856
Other (expense) income	(4,893)	(1,778)	255
Income before income taxes	376,404	368,515	396,705
Income tax expense	78,544	75,211	79,884
Net income	$ 297,860	$ 293,304	$ 316,821
Class A common stock
Net income per share
Class A common stock - basic (in dollars per share)	$ 6.40	$ 6.30	$ 6.80
Class A common stock - diluted (in dollars per share)	$ 5.69	$ 5.61	$ 6.06
Weighted average shares outstanding – Basic
Common stock - basic (in shares)	46,188,806	46,188,659	46,188,836
Weighted average shares outstanding – Diluted
Common stock - diluted (in shares)	52,307,302	52,313,360	52,319,860
Class B common stock
Net income per share
Class A common stock - basic (in dollars per share)	$ 959	$ 945	$ 1,020
Class A common stock - diluted (in dollars per share)	959	945	1,020
Class B common stock - basic and diluted (in dollars per share)	$ 959	$ 945	$ 1,020
Weighted average shares outstanding – Basic
Common stock - basic (in shares)	2,542	2,542	2,542
Weighted average shares outstanding – Diluted
Common stock - diluted (in shares)	2,542	2,542	2,542
Management fee revenue - policy issuance and renewal services
Operating revenue
Total operating revenue	$ 1,913,166	$ 1,841,794	$ 1,810,457
Operating expenses
Total operating expenses	1,677,397	1,588,897	1,537,949
Management fee revenue - administrative services
Operating revenue
Total operating revenue	58,286	59,463	57,204
Administrative services reimbursement revenue
Operating revenue
Total operating revenue	638,483	609,435	582,010
Operating expenses
Total operating expenses	638,483	609,435	582,010
Service agreement revenue
Operating revenue
Total operating revenue	$ 24,042	$ 25,797	$ 27,627