Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Common stock, par value		$ 0.01	$ 0.01
Common stock, shares authorized		500,000,000	500,000,000
Common stock, shares issued		52,580,246	51,818,186
Treasury stock, shares		5,329,820	5,050,285
Investments	[1]	$ 155,213	$ 224,932
Due from brokers	[1]	1,743	14,240
Other assets	[1]	7,433	9,208
Due to brokers	[1]	366	5,121
Other liabilities and accrued expenses	[1]	13,972	13,935
Investments
Trading investment and held as collateral		1,713	1,807
GLI SICAV, GRP-CIP, SICAV GRE and SICAV RAP [Member]
Investments		82,829
Due from brokers		1,743
Other assets		1,041
Due to brokers		366
Other liabilities and accrued expenses		$ 784
GLI SICAV, GRP-CIP, SICAV Preferred and SICAV RAP [Member]
Investments			136,113
Due from brokers			11,187
Other assets			2,604
Due to brokers			4,422
Other liabilities and accrued expenses			$ 440

[1] Asset and liability amounts in parentheses represent the aggregated balances at December 31, 2019 and 2018 attributable to variable interest entities consolidated by the Company. Refer to Note 4 for further discussion.