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Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Common Stock:
Treasury stock (in shares)	2,410,964	1,583,380
Class A Common Stock
Common Stock:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in dollars per share)	446,863,844	446,863,844
Common stock, shares issued (in shares)	52,178,453	51,997,061
Common stock, shares outstanding (in shares)	49,767,489	50,413,681
Class B Common Stock
Common Stock:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in dollars per share)	3,136,156	3,136,156
Common stock, shares issued (in shares)	477,321	477,321
Common stock, shares outstanding (in shares)	477,321	477,321

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