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Sale of Certain Agency Business - Narrative (Details)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Interger
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Interger
Sep. 30, 2020
USD ($)
Other gains $ 2,778,000   $ 11,688,000 $ 260,000
Venture Holdings, Inc        
Other gains   $ 8,900,000    
Purchase price   10,000,000.0    
Paid in cash   $ 1,000,000.0    
Number of promissory notes | Interger 2   2  
Payment annum rate     7.00%  
Payment maturity period     5 years  
Venture Holdings, Inc | Prepayment Penalty        
Repayments of Debt     $ 0  
Venture Holdings, Inc | Promissory Notes One        
Remaining balance paid by promissory note     6,000,000.0  
Venture Holdings, Inc | Promissory Notes Two        
Remaining balance paid by promissory note     3,000,000.0  
Venture Holdings, Inc | Promissory Notes        
Remaining balance paid by promissory note     $ 9,000,000.0