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Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Treasury stock (in shares)	1,583,380	1,583,380
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	446,863,844	446,863,844
Common stock, shares issued (in shares)	51,981,149	51,755,398
Common stock, shares outstanding (in shares)	50,397,769	50,172,018
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	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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Face amount or stated value per share of common stock.

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-Topic 210
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