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Acquisition (Amortization Expense) (Details) - Scenario, Plan - Cowen Insurance
$ in Thousands
Mar. 31, 2021
USD ($)
Business Acquisition [Line Items]  
2021 $ 343
2022 458
2023 458
2024 458
2025 458
Finite-Lived Intangible Asset, Expected Amortization, after Year Five 2,365
Finite-Lived Intangible Assets, Net $ 4,540