Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Operating Revenues:
Total revenues		$ 72,830	$ 63,874
Operating Expenses:
Compensation and benefits		22,627	17,295
Fund management and administration		15,521	14,485
Marketing and advertising		3,006	2,468
Sales and business development		2,145	3,417
Contractual gold payments (Note 9)		4,270	3,760
Professional fees		2,013	1,273
Occupancy, communications and equipment		1,475	1,551
Depreciation and amortization		252	256
Third-party distribution fees		1,343	1,355
Acquisition and disposition-related costs			383
Other		1,571	1,997
Total operating expenses		54,223	48,240
Operating income		18,607	15,634
Other Income/(Expenses):
Interest expense		(2,296)	(2,419)
Gain/(loss) on revaluation of deferred consideration – gold payments (Note 9)		2,832	(2,208)
Interest income		231	163
Impairments (Notes 12 and 22)		(303)	(19,672)
Other losses, net		(5,893)	(2,507)
Income/(loss) before income taxes		13,178	(11,009)
Income tax benefit		(1,969)	(2,371)
Net income/(loss)		$ 15,147	$ (8,638)
Earnings/(loss) per share – basic (Note 18)		$ 0.09	$ (0.06)
Earnings/(loss) per share – diluted (Note 18)		$ 0.09	$ (0.06)
Weighted-average common shares – basic (Note 18)		145,649	152,519
Weighted-average common shares – diluted (Note 18)	[1]	161,831	152,519
Cash dividends declared per common share		$ 0.03	$ 0.03
Advisory Fees [Member]
Operating Revenues:
Total revenues		$ 71,616	$ 62,950
Other Income [Member]
Operating Revenues:
Total revenues		$ 1,214	$ 924

[1] Excludes 15,025 participating securities and 16 potentially dilutive non-participating common stock equivalents for the three months ended March 31, 2020 as the Company reported a net loss for the period (shares herein are reported in thousands).