STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating revenue
Total operating revenue	$ 726,143	$ 680,030	$ 1,398,253	$ 1,310,207
Operating expenses
Total operating expenses	622,143	594,965	1,209,941	1,149,047
Operating income	104,000	85,065	188,312	161,160
Investment income
Net investment income	8,268	13,650	18,772	30,747
Net realized and unrealized investment (losses) gains	(10,324)	2,769	(17,603)	3,573
Net impairment (losses) recoveries recognized in earnings	(38)	(1)	(254)	86
Total investment (loss) income	(2,094)	16,418	915	34,406
Interest expense	895	1,039	1,894	2,048
Other income (expense)	337	(548)	810	(1,067)
Income before income taxes	101,348	99,896	188,143	192,451
Income tax expense	21,201	20,867	39,377	39,856
Net income	$ 80,147	$ 79,029	$ 148,766	$ 152,595
Class A common stock
Earnings per share - Basic and diluted:
Common stock - basic (in dollars per share)	$ 1.72	$ 1.70	$ 3.19	$ 3.28
Common stock - diluted (in dollars per share)	$ 1.53	$ 1.51	$ 2.84	$ 2.92
Weighted average shares outstanding – Basic
Common stock - basic (in shares)	46,188,845	46,188,289	46,188,803	46,188,573
Weighted average shares outstanding – Diluted
Common stock - diluted (in shares)	52,296,139	52,302,370	52,298,321	52,309,163
Dividends declared per share
Dividends declared (in dollars per share)	$ 1.11	$ 1.035	$ 2.22	$ 2.070
Class B common stock
Earnings per share - Basic and diluted:
Common stock - basic (in dollars per share)	258	255	479	491
Common stock - diluted (in dollars per share)	$ 258	$ 255	$ 479	$ 491
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)	$ 166.50	$ 155.25	$ 333.00	$ 310.50
Management fee revenue - policy issuance and renewal services
Operating revenue
Total operating revenue	$ 544,555	$ 502,271	$ 1,032,547	$ 957,989
Operating expenses
Total operating expenses	461,468	437,775	885,939	838,324
Management fee revenue - administrative services
Operating revenue
Total operating revenue	14,476	14,667	28,789	29,514
Administrative services reimbursement revenue
Operating revenue
Total operating revenue	160,675	157,190	324,002	310,723
Operating expenses
Total operating expenses	160,675	157,190	324,002	310,723
Service agreement revenue
Operating revenue
Total operating revenue	$ 6,437	$ 5,902	$ 12,915	$ 11,981