STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating revenue
Management fee revenue, net	$ 441,319	$ 416,665	$ 833,377	$ 784,123
Service agreement revenue	7,245	7,219	14,503	14,489
Total operating revenue	448,564	423,884	847,880	798,612
Operating expenses
Commissions	251,383	235,794	471,861	444,508
Salaries and employee benefits	60,774	55,025	120,514	108,314
All other operating expenses	53,363	47,306	105,927	92,366
Total operating expenses	365,520	338,125	698,302	645,188
Operating income	83,044	85,759	149,578	153,424
Investment income
Net investment income	6,236	4,891	12,214	9,553
Net realized investment gains (losses)	124	399	640	(689)
Net impairment losses recognized in earnings	(61)	0	(182)	(345)
Equity in earnings of limited partnerships	149	2,114	362	1,444
Total investment income	6,448	7,404	13,034	9,963
Interest expense, net	257		423
Income before income taxes	89,235	93,163	162,189	163,387
Income tax expense	30,708	31,854	55,786	56,183
Net income	$ 58,527	$ 61,309	$ 106,403	$ 107,204
Class A
Net income per share
Common stock - basic (in dollars per share)	$ 1.26	$ 1.32	$ 2.28	$ 2.30
Common stock - diluted (in dollars per share)	$ 1.12	$ 1.17	$ 2.03	$ 2.04
Weighted average shares outstanding – Basic
Common stock - basic (in shares)	46,180,852	46,188,867	46,184,666	46,188,967
Weighted average shares outstanding – Diluted
Common stock - diluted (in shares)	52,299,395	52,392,862	52,355,214	52,458,394
Dividends declared per share
Common stock (in dollars per share)	$ 0.7825	$ 0.7300	$ 1.5650	$ 1.4600
Class B
Net income per share
Common stock - basic (in dollars per share)	189	197	343	345
Common stock - diluted (in dollars per share)	$ 188	$ 197	$ 343	$ 345
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	$ 234.750	$ 219.000