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Long-Term Debt (Details) - USD ($)
3 Months Ended
Sep. 28, 2020
Nov. 21, 2019
Mar. 31, 2021
Mar. 31, 2020
May 31, 2024
May 31, 2023
Dec. 31, 2020
May 31, 2020
Debt Instrument [Line Items]                
Long-term debt outstanding     $ 223,424,000       $ 115,000,000  
Long-term debt, percentage bearing annual interest rate     3.384%          
Amount of borrowings     $ 177,100,000          
Repayments of borrowings     $ 68,700,000          
Averaged interest rate on borrowings     3.19% 3.60%        
Commitment fees on borrowings     $ 300,000 $ 200,000        
Amortization of deferred financing costs     141,000 80,000        
Interest rate swaps                
Debt Instrument [Line Items]                
Fixed rate               0.286%
Notional amount               $ 125,000,000
Interest rate swaps | Scenario, Forecast                
Debt Instrument [Line Items]                
Notional amount         $ 75,000,000 $ 100,000,000    
EEH Credit Agreement                
Debt Instrument [Line Items]                
Credit agreement, covenant, current ratio   1.0            
Credit agreement, covenant, leverage ratio   3.5            
Long-term debt outstanding     223,400,000       $ 115,000,000.0  
Additional borrowing base available under credit agreement     136,600,000          
Capitalized costs associated with borrowings     $ 0 $ 0        
EEH Credit Agreement | Minimum                
Debt Instrument [Line Items]                
Increase in interest rate on outstanding borrowings 0.25%              
Applicable margin percentage   1.50%            
Commitment fee percentage   0.375%            
EEH Credit Agreement | Maximum                
Debt Instrument [Line Items]                
Interest rate, stated percentage 0.50%              
Applicable margin percentage   2.75%            
Commitment fee percentage   0.50%            
EEH Credit Agreement | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Applicable margin percentage   1.00%            
EEH Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum                
Debt Instrument [Line Items]                
Applicable margin percentage   2.50%            
EEH Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum                
Debt Instrument [Line Items]                
Applicable margin percentage   3.75%            
EEH Credit Agreement | Federal Funds Rate                
Debt Instrument [Line Items]                
Applicable margin percentage   0.50%