Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating Revenues:
Total revenues	$ 72,414	$ 78,112	$ 228,035	$ 225,143
Operating Expenses:
Compensation and benefits	23,714	22,027	73,066	64,985
Fund management and administration	16,285	15,181	47,855	43,495
Marketing and advertising	3,145	2,925	11,062	9,525
Sales and business development	2,724	2,935	8,464	7,239
Contractual gold payments (Note 9)	4,105	4,250	13,001	12,834
Professional fees	2,367	1,583	11,134	5,517
Occupancy, communications and equipment	986	1,163	2,788	3,904
Depreciation and amortization	58	185	158	693
Third-party distribution fees	1,833	1,873	5,863	5,346
Other	2,324	1,787	6,278	5,110
Total operating expenses	57,541	53,909	179,669	158,648
Operating income	14,873	24,203	48,366	66,495
Other Income/(Expenses):
Interest expense	(3,734)	(3,729)	(11,199)	(8,592)
Gain on revaluation of deferred consideration—gold payments (Note 9)	77,895	1,737	63,188	5,066
Interest income	811	689	2,375	1,145
Impairments (Notes 8, 12 and 23)	0	(15,853)	0	(16,156)
Other losses, net	(5,289)	(714)	(34,470)	(6,558)
Income before income taxes	84,556	6,333	68,260	41,400
Income tax expense/(benefit)	3,327	500	(10,713)	2,790
Net income	$ 81,229	$ 5,833	$ 78,973	$ 38,610
Earnings per share—basic	$ 0.5	$ 0.04	$ 0.49	$ 0.24
Earnings per share—diluted	$ 0.5	$ 0.04	$ 0.49	$ 0.24
Weighted-average common shares—basic	143,120	142,070	142,984	144,445
Weighted-average common shares—diluted	158,953	159,213	158,741	161,706
Cash dividends declared per common share	$ 0.03	$ 0.03	$ 0.09	$ 0.09
Advisory Fees [Member]
Operating Revenues:
Total revenues	$ 70,616	$ 76,400	$ 222,719	$ 220,611
Other Income [Member]
Operating Revenues:
Total revenues	$ 1,798	$ 1,712	$ 5,316	$ 4,532