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Long-Term Debt - Additional Information (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 28, 2020
Aug. 25, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Sep. 22, 2020
Jun. 23, 2017
Debt Instrument [Line Items]                  
Payment for Debt Extinguishment or Debt Prepayment Cost $ 2,500,000 $ 1,700,000     $ 0 $ 2,507,000      
Write-off of debt issuance costs 341,200 200,000     0 341,000      
Debt Instrument, Repurchase Amount 1,400,000     $ 1,400,000   1,400,000      
Gain (Loss) on Repurchase of Debt Instrument       85,560 0 86,000      
Debt Instrument, Increase, Accrued Interest   1,900,000              
Debt Issuance Costs, Gross               $ 3,100,000  
Long-term debt     $ 124,012,000   124,012,000   $ 123,846,000    
Repayments of Secured Debt   $ 50,000,000     0 148,574,000      
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   25.00%              
Debt Issuance Cost, Amount paid to Subsidiary               1,900,000  
Debt Issuance Costs, Net               $ 1,200,000  
6.75% Senior Secured Notes [Member]                  
Debt Instrument [Line Items]                  
Long-term Debt, Gross $ 150,000,000                
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 101.6875%                
Long Term Debt, Amount held in Treasury $ 1,400,000                
Interest Expense, Debt       $ 2,400,000   $ 7,400,000      
Long Term Debt, Net Amount Outstanding $ 148,600,000                
6.75% Senior Secured Notes [Member] | Senior Secured Notes                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount                 $ 200,000,000
Interest rate               6.75% 6.75%
5.50% Senior Secured Notes                  
Debt Instrument [Line Items]                  
Long-term Debt, Gross     125,000,000   125,000,000   $ 125,000,000    
Interest Expense, Debt     $ 1,700,000   $ 5,200,000        
5.50% Senior Secured Notes | Senior Secured Notes                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount               $ 125,000,000  
Interest rate               5.50%  
Debt Instrument, Interest Rate, Effective Percentage     5.50%   5.50%