STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating revenue
Operating revenue	$ 687,839	$ 653,481	$ 1,998,046	$ 1,927,237
Operating expenses
Operating expenses	592,736	557,256	1,741,783	1,654,132
Operating income	95,103	96,225	256,263	273,105
Investment income
Net investment income	18,858	10,645	49,605	20,353
Net realized investment gains	1,610	5,915	5,183	1,635
Net impairment recoveries (losses) recognized in earnings	130	(122)	216	(3,192)
Total investment income	20,598	16,438	55,004	18,796
Interest expense, net	1,034	3	3,082	8
Other expense	541	964	1,608	1,588
Income before income taxes	114,126	111,696	306,577	290,305
Income tax expense	23,903	22,480	63,759	59,786
Net income	$ 90,223	$ 89,216	$ 242,818	$ 230,519
Class A common stock
Earnings per share - Basic and diluted:
Common stock - basic (in dollars per share)	$ 1.94	$ 1.92	$ 5.21	$ 4.95
Common stock - diluted (in dollars per share)	$ 1.72	$ 1.71	$ 4.64	$ 4.41
Weighted average shares outstanding – Basic
Common stock - basic (in shares)	46,189,035	46,189,030	46,188,729	46,188,544
Weighted average shares outstanding – Diluted
Common stock - diluted (in shares)	52,305,245	52,310,429	52,307,859	52,312,588
Dividends declared per share
Common stock (in dollars per share)	$ 1.035	$ 0.965	$ 3.105	$ 2.895
Class B common stock
Earnings per share - Basic and diluted:
Common stock - basic (in dollars per share)	291	287	782	742
Common stock - diluted (in dollars per share)	$ 291	$ 287	$ 782	$ 742
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
Common stock (in dollars per share)	$ 155.25	$ 144.75	$ 465.75	$ 434.25
Management fee revenue - policy issuance and renewal services
Operating revenue
Operating revenue	$ 504,891	$ 484,551	$ 1,462,880	$ 1,412,096
Operating expenses
Operating expenses	430,326	409,546	1,268,650	1,202,903
Management fee revenue - administrative services
Operating revenue
Operating revenue	14,471	14,910	43,985	44,494
Administrative services reimbursement revenue
Operating revenue
Operating revenue	162,410	147,710	473,133	451,229
Operating expenses
Operating expenses	162,410	147,710	473,133	451,229
Service agreement revenue
Operating revenue
Operating revenue	$ 6,067	$ 6,310	$ 18,048	$ 19,418