CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Operating revenue
Total operating revenue	$ 1,089,796	$ 1,060,097	$ 2,101,707	$ 2,049,496
Operating expenses
Total operating expenses	885,673	860,924	1,730,797	1,698,947
Operating income	204,123	199,173	370,910	350,549
Investment income
Net investment income	22,587	20,030	46,147	39,978
Net realized and unrealized investment gains (losses)	557	479	(208)	981
Net impairment losses recognized in earnings	(591)	(909)	(1,267)	(1,823)
Total investment income	22,553	19,600	44,672	39,136
Other income	1,401	1,974	2,821	5,808
Income before income taxes	228,077	220,747	418,403	395,493
Income tax expense	47,783	46,062	87,635	82,391
Net income	$ 180,294	$ 174,685	$ 330,768	$ 313,102
Class A common stock
Earnings per share - Basic and diluted:
Common stock - basic (in dollars per share)	$ 3.87	$ 3.75	$ 7.10	$ 6.72
Common stock - diluted (in dollars per share)	$ 3.45	$ 3.34	$ 6.32	$ 5.99
Weighted average shares outstanding – Basic
Common stock - Basic (in shares)	46,189,033	46,189,063	46,188,942	46,188,984
Weighted average shares outstanding – Diluted
Common stock - Diluted (in shares)	52,298,697	52,304,407	52,299,440	52,304,397
Dividends declared per share
Dividends declared (in dollars per share)	$ 1.4625	$ 1.365	$ 2.925	$ 2.73
Class B common stock
Earnings per share - Basic and diluted:
Common stock - basic (in dollars per share)	581	563	1,065	1,008
Common stock - diluted (in dollars per share)	$ 581	$ 563	$ 1,065	$ 1,008
Weighted average shares outstanding – Basic
Common stock - Basic (in shares)	2,542	2,542	2,542	2,542
Weighted average shares outstanding – Diluted
Common stock - Diluted (in shares)	2,542	2,542	2,542	2,542
Dividends declared per share
Dividends declared (in dollars per share)	$ 219.375	$ 204.75	$ 438.75	$ 409.50
Management fee revenue - policy issuance and renewal services
Operating revenue
Total operating revenue	$ 862,879	$ 823,853	$ 1,649,278	$ 1,578,902
Operating expenses
Total operating expenses	684,119	648,280	1,329,147	1,276,030
Management fee revenue - administrative services
Operating revenue
Total operating revenue	19,619	18,296	39,094	35,941
Administrative services reimbursement revenue
Operating revenue
Total operating revenue	201,554	212,644	401,650	422,917
Operating expenses
Total operating expenses	201,554	212,644	401,650	422,917
Service agreement revenue
Operating revenue
Total operating revenue	$ 5,744	$ 5,304	$ 11,685	$ 11,736