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Debt - 2018 Credit Agreement (Details)
Jul. 31, 2019
USD ($)
Dec. 13, 2018
USD ($)
Dec. 13, 2022
USD ($)
Dec. 13, 2021
USD ($)
Dec. 16, 2020
USD ($)
Dec. 13, 2020
USD ($)
Apr. 21, 2020
USD ($)
Dec. 13, 2019
USD ($)
Debt Instrument [Line Items]                
Letters of credit         $ 1,800,000      
Other indebtedness         18,000      
2018 Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 60,000,000            
Pre-funded amount held in restricted cash         4,100,000      
Periodic payment           $ 10,000,000.0   $ 10,000,000.0
Principal payments due         6,600,000      
Commitment fee percentage   0.50%            
Prepayment fee percentage, year three   0.020            
Prepayment fee percentage, year four   0.010            
Commitment fee expense   $ 1,600,000            
Percentage of net proceeds from asset sales applied to mandatory prepayments of 2018 term loan   0.80%            
Minimum liquidity covenant threshold         $ 3,000,000.0      
Coverage ratio         2.50      
Medium-term Notes | 2018 Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 80,000,000.0            
Delayed Draw Term Loan | 2018 Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity   10,000,000            
Undrawn portion of debt             $ 5,000,000.0  
Delayed Draw Term Loan | 2018 Credit Agreement, First Amendment                
Debt Instrument [Line Items]                
Loan term 1 year              
Commitments under term loan $ 0              
Revolver | Line of Credit | 2018 Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 10,000,000            
LIBOR | 2018 Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   7.75%            
Scenario, Forecast | 2018 Credit Agreement                
Debt Instrument [Line Items]                
Periodic payment     $ 15,000,000.0 $ 15,000,000.0