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Long-Term Debt - Additional Information (Narrative) (Details) - USD ($)
3 Months Ended
Aug. 25, 2019
Jun. 23, 2017
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 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     $ 4,000 $ 200,000 $ 0    
Debt Instrument, Repurchase Amount     1,400,000        
Debt Instrument, Payment of Interest     22,807        
Gain (Loss) on Repurchase of Debt Instrument     85,560   0    
Long-term Debt, Gross     148,574,000     $ 150,000,000  
Debt Instrument, Increase, Accrued Interest     1,900,000        
Long-term debt     148,142,000     $ 149,515,000  
Repayments of Secured Debt $ 50,000,000            
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 25.00%            
6.75% Senior Secured Notes [Member] | Senior Secured Notes              
Debt Instrument [Line Items]              
Private placement date   Jun. 23, 2017          
Debt Instrument, Face Amount   $ 200,000,000          
Interest rate   6.75%          
Debt Issuance Costs, Gross   $ 4,300,000          
Interest expense on note     2,500,000   $ 3,400,000    
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          
Oppenheimer [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes              
Debt Instrument [Line Items]              
Debt Issuance Costs, Gross   3,000,000          
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