STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue
Management fee revenue, net	$ 435,214	$ 411,139	$ 1,268,591	$ 1,195,262
Service agreement revenue	7,278	7,267	21,781	21,756
Total operating revenue	442,492	418,406	1,290,372	1,217,018
Operating expenses
Commissions	248,677	232,455	720,538	676,963
Salaries and employee benefits	60,499	53,265	181,013	161,579
All other operating expenses	52,480	50,431	158,407	142,797
Total operating expenses	361,656	336,151	1,059,958	981,339
Operating income	80,836	82,255	230,414	235,679
Investment income
Net investment income	5,970	5,331	18,184	14,884
Net realized investment gains	899	718	1,539	29
Net impairment losses recognized in earnings	0	0	(182)	(345)
Equity in earnings (losses) of limited partnerships	1,537	(1,723)	1,899	(279)
Total investment income	8,406	4,326	21,440	14,289
Interest expense, net	377		800
Income before income taxes	88,865	86,581	251,054	249,968
Income tax expense	30,322	29,205	86,108	85,388
Net income	$ 58,543	$ 57,376	$ 164,946	$ 164,580
Class A
Net income per share
Common stock - basic (in dollars per share)	$ 1.26	$ 1.23	$ 3.54	$ 3.53
Common stock - diluted (in dollars per share)	$ 1.12	$ 1.09	$ 3.15	$ 3.14
Weighted average shares outstanding – Basic
Common stock - basic (in shares)	46,188,949	46,188,980	46,186,109	46,188,971
Weighted average shares outstanding – Diluted
Common stock - diluted (in shares)	52,316,876	52,411,303	52,342,450	52,442,697
Dividends declared per share
Common stock (in dollars per share)	$ 0.7825	$ 0.7300	$ 2.3475	$ 2.1900
Class B
Net income per share
Common stock - basic (in dollars per share)	189	185	531	530
Common stock - diluted (in dollars per share)	$ 189	$ 185	$ 531	$ 529
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)	$ 117.375	$ 109.500	$ 352.125	$ 328.500