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Borrowings - Narrative (Details)
1 Months Ended 3 Months Ended
Jun. 01, 2022
Sep. 09, 2019
USD ($)
Jun. 01, 2012
Jan. 31, 2010
USD ($)
Dec. 31, 2021
USD ($)
lender
Sep. 30, 2021
USD ($)
May 31, 2018
USD ($)
Senior Notes [Abstract]              
Ownership interest In guarantor subsidiaries         100.00%    
Junior Subordinated Notes              
Junior Subordinated Notes [Abstract]              
Aggregate principle balance of notes         $ 100,800,000    
Weighted average fixed interest rate of debt         3.82%    
Unamortized accretion         $ 30,053,000 $ 30,570,000  
Junior Subordinated Debt, Modified Terms              
Unsecured Debt [Abstract]              
Aggregate principal amount of debt       $ 75,000,000      
Junior Subordinated Notes [Abstract]              
Redemption price percentage     75.00%        
Junior Subordinated Debt, Modified Terms | LIBOR              
Junior Subordinated Notes [Abstract]              
Variable rate floor       4.25%      
Variable rate cap       9.25%      
Junior Subordinated Debt, Modified Terms | Forecast              
Junior Subordinated Notes [Abstract]              
Annual increase of percentage of principal amount redeemable 1.785%            
Junior Subordinated Debt, Original Terms              
Unsecured Debt [Abstract]              
Aggregate principal amount of debt         $ 25,800,000    
Junior Subordinated Debt, Original Terms | LIBOR              
Junior Subordinated Notes [Abstract]              
Basis spread on variable rate         2.45%    
Senior Unsecured Term Loans September 2022 | Senior Notes              
Unsecured Debt [Abstract]              
Aggregate principal amount of debt         $ 50,000,000    
Periodic payment   $ 50,000,000          
Stated interest rate on debt instrument   4.875%          
Revolving Credit Facility              
Line of Credit Facility [Abstract]              
Credit facility borrowing capacity         $ 250,000,000    
Number of lenders | lender         4    
Borrowings outstanding         $ 0 0  
Letters of credit secured using cash collateral         0 0  
Amount of available borrowings under the secured revolving credit facility         250,000,000 250,000,000  
Letter of Credit              
Line of Credit Facility [Abstract]              
Letters of credit secured using cash collateral         23,700,000 21,800,000  
Collateral amount         24,600,000 $ 22,300,000  
Standby Letters of Credit | Standby Letters for Credit Facility              
Line of Credit Facility [Abstract]              
Credit facility borrowing capacity             $ 50,000,000
Letters of credit secured using cash collateral         $ 8,200,000    
Standby Letters of Credit | Backstop Standby Letters of Credit              
Line of Credit Facility [Abstract]              
Credit facility borrowing capacity             $ 40,000,000