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Long-Term Debt - Additional Information (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Aug. 25, 2019
Jun. 23, 2017
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Sep. 19, 2017
Debt Instrument [Line Items]                  
Payment for Debt Extinguishment or Debt Prepayment Cost $ 1,700,000                
Write-off of debt issuance costs       $ 200,000   $ 4,000 $ 0    
Debt Instrument, Repurchase Amount     $ 1,400,000     1,400,000      
Debt Instrument, Payment of Interest     22,807            
Gain (Loss) on Repurchase of Debt Instrument     85,560     86,000 0    
Long-term Debt, Gross     148,574,000     148,574,000   $ 150,000,000  
Debt Instrument, Increase, Accrued Interest     1,900,000            
Long-term debt     148,190,000     148,190,000   $ 149,515,000  
Repayments of Secured Debt $ 50,000,000.0                
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 25.00%                
6.75% Senior Secured Notes [Member] | Senior Secured Notes                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount   $ 200,000,000.0              
Interest rate   6.75%              
Debt Issuance Costs, Gross   $ 4,300,000              
Interest expense on note     2,500,000   $ 3,400,000 5,000,000.0 $ 6,800,000    
Debt Instrument, Issue Price Percentage   100.00%              
Percentage of Notes Registered under the Securities Act of 1933                 99.80%
8.75% Senior Secured Notes [Member] | Senior Secured Notes                  
Debt Instrument [Line Items]                  
Interest rate   8.75%              
Extinguishment of Debt, Amount   $ 120,000,000.0              
Oppenheimer [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes                  
Debt Instrument [Line Items]                  
Debt Issuance Costs, Gross   3,000,000.0              
Third Party [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes                  
Debt Instrument [Line Items]                  
Debt Issuance Costs, Gross   $ 1,300,000              
Maximum [Member] | 6.75% Senior Secured Notes [Member]                  
Debt Instrument [Line Items]                  
Restrictive Covenants Exception for Dividend or Distribution Amount during fiscal year           20,000,000      
Restrictive Covenants Exception for total Dividend Payment and other Restricted Payments     $ 10,000,000     $ 10,000,000