Quarterly report pursuant to Section 13 or 15(d)

Indebtedness (Details)

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Indebtedness (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 16, 2020
Apr. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Apr. 30, 2020
Debt Instrument [Line Items]            
Proceeds from revolving credit facility     $ 0 $ 65,000,000    
Revolving Credit Facility            
Debt Instrument [Line Items]            
Aggregate principal amount           $ 225,000,000
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Interest rate spread above LIBOR as of reporting period 1.00%          
Revolving Credit Facility            
Debt Instrument [Line Items]            
Credit facility amount     112,500,000   $ 112,500,000 250,000,000
Available borrowing capacity     $ 94,174,000      
Interest rate at period end     3.25% 2.30%    
Term 5 years          
Aggregate principal amount $ 150,000,000          
Additional borrowing capacity of credit facility           $ 25,000,000
Revolving Credit Facility | Subsequent Event            
Debt Instrument [Line Items]            
Proceeds from revolving credit facility   $ 20,000,000        
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Interest rate spread above LIBOR as of reporting period 1.00%          
Minimum interest rate spread 2.25%          
Maximum interest rate spread 2.75%          
Minimum margin 0.25%          
Maximum margin 0.75%          
Revolving Credit Facility | Base Rate            
Debt Instrument [Line Items]            
Minimum interest rate 3.00%          
Revolving Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate            
Debt Instrument [Line Items]            
Interest rate spread above LIBOR as of reporting period 0.50%          
Letter of Credit            
Debt Instrument [Line Items]            
Outstanding amount     $ 18,326,000      
Sublimit amount $ 30,000,000          
Swing Line Loan            
Debt Instrument [Line Items]            
Sublimit amount $ 30,000,000