Quarterly report pursuant to Section 13 or 15(d)

Indebtedness - Narrative (Details)

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Indebtedness - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2020
Dec. 31, 2021
Jul. 31, 2021
Sep. 30, 2017
Mar. 31, 2022
Apr. 30, 2021
Mar. 31, 2021
Revolving Credit Facility              
Debt Instrument [Line Items]              
Term       5 years      
Credit facility amount $ 250,000 $ 525,000   $ 150,000      
Aggregate principal amount 225,000,000 450,000          
Additional borrowing capacity of credit facility $ 25,000,000 75,000          
Borrowings outstanding   300,000          
Repayments of debt   150,000          
Available borrowing capacity   272,466,000     $ 272,466,000    
Bloomberg short-term bank yield index rate floor     0.00%        
Base rate floor 3.00%   2.00%        
Federal funds rate floor 0.00%   0.00%        
Bloomberg short-term bank yield index additional rate     1.00%        
Interest rate at period end         1.44%   3.25%
LIBOR floor rate 1.00%         1.00%  
LIBOR floor additional rate 1.00%            
Revolving Credit Facility | Medium-term Notes              
Debt Instrument [Line Items]              
Borrowings outstanding   150,000          
Proceeds from revolving credit facility         $ 150,000    
Revolving Credit Facility | Bloomberg Short-Term Bank Yield Index | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.25%        
Revolving Credit Facility | Bloomberg Short-Term Bank Yield Index | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.75%        
Revolving Credit Facility | Federal Funds Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.50%   0.50%        
Revolving Credit Facility | Prime Rate | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.25%   0.00%        
Revolving Credit Facility | Prime Rate | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.75%   0.50%        
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.25%            
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.75%            
Letter of Credit              
Debt Instrument [Line Items]              
Credit facility amount       30,000      
Outstanding amount   $ 20,034,000     $ 20,034,000    
Swing Line Loan              
Debt Instrument [Line Items]              
Credit facility amount       $ 30,000