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Acquisition (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 26, 2021
Mar. 31, 2021
Mar. 31, 2020
Business Acquisition [Line Items]      
Purchase of business   $ (2,109) $ 0
Cowen Insurance      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred   12,700  
Payments to Acquire Businesses, Gross   12,500  
Other payments to acquire businesses   200  
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed   200  
Cowen Insurance | Scenario, Plan      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred   $ 12,735  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 17,951    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 4,794    
Business Combination, Bargain Purchase, Gain Recognized, Amount 5,216    
Business Combination Bargain Purchase Gain Related Tax Expense $ 1,300