STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating revenue
Total operating revenue	$ 2,840,124	$ 2,633,977	$ 2,536,489
Operating expenses
Total operating expenses	2,463,910	2,315,880	2,198,332
Operating income	376,214	318,097	338,157
Investment income
Net investment income	28,585	62,177	29,753
Net realized and unrealized investment (losses) gains	(27,286)	4,946	6,392
Net impairment (losses) recoveries recognized in earnings	(667)	209	(3,278)
Total investment income	632	67,332	32,867
Interest expense, net	2,009	4,132	731
Other income (expense)	1,615	(4,893)	(1,778)
Income before income taxes	376,452	376,404	368,515
Income tax expense	77,883	78,544	75,211
Net income	$ 298,569	$ 297,860	$ 293,304
Class A common stock
Earnings per share - Basic and diluted:
Common stock - basic (in dollars per share)	$ 6.41	$ 6.40	$ 6.30
Common stock - diluted (in dollars per share)	$ 5.71	$ 5.69	$ 5.61
Weighted average shares outstanding – Basic
Common stock - basic (in shares)	46,188,916	46,188,806	46,188,659
Weighted average shares outstanding – Diluted
Common stock - diluted (in shares)	52,297,990	52,307,302	52,313,360
Class B common stock
Earnings per share - Basic and diluted:
Common stock - basic (in dollars per share)	$ 962	$ 959	$ 945
Common stock - diluted (in dollars per share)	$ 962	$ 959	$ 945
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	$ 2,087,846	$ 1,913,166	$ 1,841,794
Operating expenses
Total operating expenses	1,795,642	1,677,397	1,588,897
Management fee revenue - administrative services
Operating revenue
Total operating revenue	58,323	58,286	59,463
Administrative services reimbursement revenue
Operating revenue
Total operating revenue	668,268	638,483	609,435
Operating expenses
Total operating expenses	668,268	638,483	609,435
Service agreement revenue
Operating revenue
Total operating revenue	$ 25,687	$ 24,042	$ 25,797