Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total revenue	$ 410,830	$ 381,111	$ 378,696
Expenses:
Employee compensation and benefits	143,431	131,292	124,076
Distribution and service fees	55,237	50,043	53,338
General and administrative	47,632	48,265	42,219
Depreciation and amortization	4,396	4,473	4,317
Total expenses	250,696	234,073	223,950
Operating income (loss)	160,134	147,038	154,746
Non-operating income (loss):
Interest and dividend income—net	6,716	10,426	4,333
Gain (loss) from investments—net	21,673	(14,264)	2,020
Foreign currency gains (losses)—net	(974)	579	(699)
Total non-operating income (loss)	27,415	(3,259)	5,654
Income before provision for income taxes	187,549	143,779	160,400
Provision for income taxes	40,565	34,257	67,914
Net income	146,984	109,522	92,486
Less: Net (income) loss attributable to redeemable noncontrolling interest	(12,363)	4,374	(547)
Net income attributable to common stockholders	$ 134,621	$ 113,896	$ 91,939
Earnings per share attributable to common stockholders:
Basic (in dollars per share)	$ 2.85	$ 2.43	$ 1.98
Diluted (in dollars per share)	$ 2.79	$ 2.40	$ 1.96
Weighted average shares outstanding:
Basic (shares)	47,273	46,794	46,353
Diluted (shares)	48,297	47,381	46,979
Investment advisory and administration fees
Total revenue	$ 378,578	$ 349,870	$ 344,900
Distribution and service fees
Total revenue	30,048	29,090	30,747
Other
Total revenue	$ 2,204	$ 2,151	$ 3,049