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DEBT - Revolving Credit Agreement (Details)
3 Months Ended 9 Months Ended
Dec. 21, 2018
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 28, 2021
USD ($)
Sep. 27, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                    
Long-term debt, gross   $ 423,835,000       $ 423,835,000       $ 453,835,000
Interest expense   5,847,000 $ 5,749,000     18,031,000 $ 17,903,000      
Repayments of lines of credit           347,000 45,584,000      
Revolving Credit Agreement                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity               $ 225,000,000 $ 175,000,000  
Line of credit facility accordion feature increase amount   50,000,000       50,000,000   $ 50,000,000    
Line of credit facility accordion feature increase limit   275,000,000       275,000,000        
Line of credit facility, unused capacity, commitment fee percentage 0.20%                  
Fixed charge coverage ratio 1.0                  
Line of credit facility, excess availability, commitment percentage, threshold 10.00%                  
Long-term debt, gross   0 0     0 0      
Interest expense   0 $ 0     0 $ 200,000      
Proceeds from issuance of long-term debt         $ 45,000,000          
Repayments of lines of credit       $ 45,000,000            
Liquidity position to meet future obligations, amount   $ 268,700,000       $ 268,700,000       $ 384,000,000
Revolving Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate 1.25%                  
Revolving Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate 1.75%                  
Revolving Credit Agreement | Base Rate | Minimum                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate 0.25%                  
Revolving Credit Agreement | Base Rate | Maximum                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate 0.75%                  
Letter of Credit | Revolving Credit Agreement                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity $ 15,000,000                  
Bridge Loan | Revolving Credit Agreement                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity $ 17,500,000