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Long-Term Debt - Narrative (Details) - USD ($)
9 Months Ended
May 19, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]        
Debt outstanding   $ 215,854,000   $ 220,216,000
Finance costs incurred   550,000 $ 1,497,000  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt outstanding   128,522,000   120,312,000
Outstanding borrowings   209,200,000    
Outstanding letters of credit   4,300,000    
Capitalized costs associated with debt modifications   1,100,000    
Revolving Credit Facility | Senior Secured Term Loan A Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity   100,000,000    
Debt outstanding   80,388,000   89,745,000
Revolving Credit Facility | Senior Secured Term Loan A Facility | Each quarter through March 31, 2022        
Debt Instrument [Line Items]        
Debt quarterly payments $ 3,750,000      
Revolving Credit Facility | Senior Secured Term Loan A Facility | Each quarter thereafter        
Debt Instrument [Line Items]        
Debt quarterly payments 5,000,000      
Revolving Credit Facility | Credit Agreement        
Debt Instrument [Line Items]        
Maximum borrowing capacity 165,000,000      
Capitalized unamortized issuance cost   100,000    
Finance costs incurred 500,000      
Expensed finance costs $ 200,000      
Maximum borrowing capacity in non-U.S. Dollar currencies   100,000,000    
Maximum amount available for the issuance of letters of credit   20,000,000    
Revolving Credit Facility | Credit Agreement | Minimum        
Debt Instrument [Line Items]        
Total consolidated leverage ratio, limit after investment in non-guarantor subsidiary 350.00%      
Revolving Credit Facility | Credit Agreement | Maximum        
Debt Instrument [Line Items]        
Total consolidated leverage ratio, if the company incurs certain subordinated debt and other indebtedness 450.00%      
Senior debt to EBITDA ratio 350.00%      
Revolving Credit Facility | Credit Agreement | LIBOR | Minimum        
Debt Instrument [Line Items]        
Floor rate 1.00%      
Revolving Credit Facility | Credit Agreement | September 30, 2021        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 155,000,000      
Revolving Credit Facility | Credit Agreement | December 31, 2021        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 150,000,000      
Revolving Credit Facility | Credit Agreement | Each quarter through March 31, 2022 | Maximum        
Debt Instrument [Line Items]        
Total consolidated debt leverage ratio 4.00      
Revolving Credit Facility | Credit Agreement | Each quarter thereafter | Minimum        
Debt Instrument [Line Items]        
Total consolidated debt leverage ratio 3.50      
Other        
Debt Instrument [Line Items]        
Debt outstanding   6,944,000   $ 10,159,000
Other | Minimum        
Debt Instrument [Line Items]        
Debt quarterly payments   $ 1,000    
Interest rate   0.40%    
Other | Maximum        
Debt Instrument [Line Items]        
Debt quarterly payments   $ 17,000    
Interest rate   3.50%