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Regulatory Requirements Regulatory (Tables)
 12 Months Ended
Dec. 31, 2019
Regulatory [Abstract]  
Computation of Net Capital under Securities and Exchange Commission Regulation
As of December 31, 2019, 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  $91,348  $1,000  $90,348  
Cowen Execution  $105,822  $2,673  $103,149  
ATM Execution  $5,354  $250  $5,104  
Cowen Prime  $13,659  $250  $13,409  
Westminster  $14,797  $250  $14,547  
Cowen International Ltd  $15,988  $7,597  $8,391  
Cowen Execution Ltd  $11,808  $2,509  $9,299  
Cowen Asia  $1,307  $385  $922