Annual report pursuant to Section 13 and 15(d)

Debt (Details)

v3.20.4
Debt (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 29, 2020
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]          
Repayments of debt     $ 50,530,000 $ 10,828,000 $ 8,764,000
Term Loan          
Line of Credit Facility [Line Items]          
Repayments of debt   $ 47,500,000      
Letter of Credit          
Line of Credit Facility [Line Items]          
Total debt   60,000 60,000    
Amended Credit Agreement | Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity $ 130,000,000        
Additional borrowing capacity 75,000,000        
Debt issuance costs $ 762,000        
Debt Issuance costs, amortization period 2 years        
Draws on revolving credit facility     0    
Unused borrowing capacity   129,900,000 $ 129,900,000    
Amended Credit Agreement | Revolving Credit Facility | London Interbank Offered Rate | Minimum          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate (percent)     1.25%    
Amended Credit Agreement | Revolving Credit Facility | London Interbank Offered Rate | Maximum          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate (percent)     3.00%    
Credit Agreement          
Line of Credit Facility [Line Items]          
Debt issuance costs   1,800,000 $ 1,800,000    
Interest expense     186,000 373,000  
Credit Agreement | Term Loan          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity   82,500,000 82,500,000    
Total debt       $ 50,500,000  
Credit Agreement | Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 82,500,000 $ 82,500,000