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Regulatory Requirements Regulatory (Tables)
9 Months Ended
Sep. 30, 2021
Regulatory [Abstract]  
Computation of Net Capital under Securities and Exchange Commission Regulation As of September 30, 2021, these regulated broker-dealers had regulatory net capital or financial resources, regulatory net capital requirements or minimum FCA or SFC requirement and excess as follows:
SubsidiaryNet CapitalMinimum Net Capital RequirementExcess Net Capital
 (dollars in thousands)
Cowen and Company$324,607 $8,854 $315,753 
ATM Execution$5,910 $250 $5,660 
Westminster$24,487 $250 $24,237 
Cowen International Ltd$38,928 $27,853 $11,075 
Cowen Execution Ltd$12,912 $3,734 $9,178 
Cowen Asia$2,299 $385 $1,914