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Debt - Narrative (Details)
3 Months Ended
Jun. 18, 2021
USD ($)
Apr. 24, 2020
USD ($)
Sep. 24, 2018
USD ($)
Mar. 31, 2021
USD ($)
debt_instrument
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
Oct. 31, 2018
USD ($)
Debt Instrument [Line Items]              
Number of debt instruments | debt_instrument       4      
Paycheck Protection Program              
Debt Instrument [Line Items]              
Face amount of debt       $ 2,700,000      
Interest rate   1.00%          
Debt   $ 2,745,000   2,745,000   $ 2,745,000  
Maturity of loan   Apr. 24, 2022          
Debt instrument, description   The Company amended its $10.0 million line of credit facility with the Lender to incorporate this loan as a reduction of the available line of credit. The loan may be prepaid by the Company at any time prior to maturity with no prepayment penalties. This loan may be subject to forgiveness under the CARES Act provisions. The Company applied for forgiveness of the loan in 2020, at which point the principal and interest payments were deferred until the SBA remits the loan forgiveness amount to the Lender. As of March 31, 2021, the loan remains on the Company’s balance sheet as a liability.          
Senior Unsecured Notes | Senior Unsecured Notes              
Debt Instrument [Line Items]              
Face amount of debt       $ 24,400,000     $ 25,300,000
Maturity date             Sep. 30, 2023
Interest rate             6.75%
Number of units repurchased | shares       0 9,761    
Repurchased face value amount         $ 244,000,000    
Gain on extinguishment of debt         $ 115,000,000    
Debt issuance costs       $ 650,000      
Subordinated notes | Subordinated notes              
Debt Instrument [Line Items]              
Face amount of debt     $ 10,500,000 $ 10,500,000      
Maturity date     Sep. 30, 2038        
Interest rate, payment terms       Interest is payable quarterly at the end of March, June, September and December.      
Call premium percentage     12.50%        
Debt issuance costs       $ 900,000      
Subordinated notes | Subordinated notes | Debt Instrument, Redemption, Period One              
Debt Instrument [Line Items]              
Interest rate     7.50%        
Call premium     $ 1,100,000        
Subordinated notes | Subordinated notes | Debt Instrument, Redemption, Period Two              
Debt Instrument [Line Items]              
Interest rate     12.50%        
Call premium     $ 1,750,000        
Subordinated notes | Subordinated notes | Debt Instrument, Redemption, Period Three              
Debt Instrument [Line Items]              
Call premium     $ 3,050,000        
Line of credit              
Debt Instrument [Line Items]              
Borrowing capacity $ 10,000,000     10,000,000      
Debt including PPP loan       $ 5,700,000      
Line of credit | LIBOR              
Debt Instrument [Line Items]              
Variable interest rate 2.75%