Annual report pursuant to Section 13 and 15(d)

Indebtedness - Narrative (Details)

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Indebtedness - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 30, 2020
Dec. 31, 2021
Jul. 31, 2021
Sep. 30, 2017
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 29, 2021
Apr. 30, 2021
Debt Instrument [Line Items]                  
Proceeds from revolving credit facility         $ 195,000,000 $ 65,000,000 $ 20,000,000    
Cash payments for interest         4,198,000 4,580,000 2,711,000    
Interest capitalized         0 0 $ 0    
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Term       5 years          
Credit facility amount $ 250,000,000 $ 525,000,000   $ 150,000 525,000,000        
Aggregate principal amount 225,000,000 450,000,000     450,000,000        
Additional borrowing capacity of credit facility $ 25,000,000             $ 75,000,000  
Outstanding under the senior credit facility   300,000,000     300,000,000        
Repayments of debt   150,000,000              
Available borrowing capacity   $ 272,466,000     $ 272,466,000 $ 94,174,000      
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   1.43%     1.43% 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]                  
Outstanding under the senior credit facility   $ 150,000,000     $ 150,000,000        
Proceeds from revolving credit facility         150,000,000        
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 letters of credit   $ 20,034,000     $ 20,034,000 $ 18,326,000      
Swing Line Loan                  
Debt Instrument [Line Items]                  
Credit facility amount       $ 30,000