Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Accounts Payable [Line Items]
Contingent Consideration Payable		$ 62,223	$ 37,953
Interest and Dividends Payable		28,948	17,031
Loss reserves and claims incurred but not reported	[1]	44,191	37,036
Professional Fees Payable		11,229	9,495
Unearned Premiums	[1]	23,241	14,732
Fees Payable		7,740	7,958
Accrued Income Taxes		20,540	17,204
Deferred Income		6,051	3,199
SEC fees payable		10,804	18,660
Software contracts payable		6,263	6,789
Estimated Litigation Liability		1,082	0
Accrued expenses and accounts payable	[2]	13,776	26,422
Accounts payable, accrued expenses and other liabilities		236,088	196,479
Cowen Insurance Co and Cowen Re
Accounts Payable [Line Items]
Reinsurance Premiums Payable		$ 3,800	$ 15,500

[1] Balances relate to the Company's reinsurance business (See Note 22).

[2] As of December 31, 2021 and 2020, the balance includes reinsurance premiums payable of $3.8 million and $15.5 million, respectively.