Quarterly report pursuant to Section 13 or 15(d)

Recently Issued Accounting Pronouncements (Narrative) (Details)

v3.22.1
Recently Issued Accounting Pronouncements (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Sep. 30, 2020
Business Acquisition [Line Items]        
Revenues $ 195,129,000 $ 146,415,000    
Junior subordinated debentures 135,197,000   $ 134,940,000  
Cash and cash equivalents 179,274,000 $ 199,150,000 140,225,000  
Prepaid expenses $ 33,546,000   $ 25,855,000  
Class A Common Stock [Member]        
Business Acquisition [Line Items]        
Common stock, shares authorized 30,000,000   30,000,000  
Class B Common Stock [Member]        
Business Acquisition [Line Items]        
Common stock, shares authorized 4,000,000   4,000,000  
Spin-off [Member]        
Business Acquisition [Line Items]        
Debt instrument, face amount $ 75,000,000.0     $ 75,000,000.0
Interest rate       6.00%
Accounting Standards Update 2020-04 [Member] | LIBOR Indexed Junior Subordinated Debentures [Member]        
Business Acquisition [Line Items]        
Junior subordinated debentures 170,900,000      
Accounting Standards Update 2020-04 [Member] | LIBOR Indexed Receivable-backed Notes Payable And Lines Of Credit [Member]        
Business Acquisition [Line Items]        
Receivable-backed notes payable and lines of credit $ 73,900,000