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Long-Term Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 27, 2020
Nov. 21, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
May 31, 2024
May 31, 2023
May 31, 2020
Mar. 26, 2020
Dec. 31, 2019
Debt Instrument [Line Items]                      
Long-term debt outstanding     $ 168,588,000   $ 168,588,000           $ 170,000,000
Long-term debt, percentage bearing annual interest rate     2.457%   2.457%            
Amount of borrowings     $ 69,900,000   $ 69,900,000            
Repayments of borrowings         $ 71,300,000            
Averaged interest rate on borrowings     2.55% 4.58% 3.07% 4.61%          
Commitment fees on borrowings     $ 100,000 $ 200,000 $ 300,000 $ 300,000          
Amortization of deferred financing costs     100,000 100,000 161,000 215,000          
EEH Credit Agreement                      
Debt Instrument [Line Items]                      
Current borrowing base under EEH credit agreement $ 275,000,000                 $ 325,000,000  
Decrease in borrowing base percentage 15.00%                    
Credit agreement, covenant, current ratio   1.0                  
Credit agreement, covenant, leverage ratio   4.0                  
Long-term debt outstanding     168,600,000   168,600,000           $ 170,000,000.0
Additional borrowing base available under credit agreement     106,400,000   $ 106,400,000            
Capitalized costs associated with borrowings     $ 0 $ 0   $ 0          
EEH Credit Agreement | Minimum                      
Debt Instrument [Line Items]                      
Applicable margin percentage   0.75%                  
Commitment fee percentage   0.375%                  
EEH Credit Agreement | Maximum                      
Debt Instrument [Line Items]                      
Applicable margin percentage   1.75%                  
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   1.75%                  
EEH Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum                      
Debt Instrument [Line Items]                      
Applicable margin percentage   2.75%                  
EEH Credit Agreement | Federal Funds Rate                      
Debt Instrument [Line Items]                      
Applicable margin percentage   0.50%                  
Interest Rate Swap                      
Debt Instrument [Line Items]                      
Fixed Rate                 0.286%    
Notional Amount                 $ 125,000,000    
Interest Rate Swap | Scenario, Forecast                      
Debt Instrument [Line Items]                      
Notional Amount             $ 75,000,000 $ 100,000,000