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Long-Term Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
Nov. 21, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
May 31, 2024
May 31, 2023
Jul. 20, 2021
Dec. 31, 2020
Dec. 18, 2020
Dec. 17, 2020
May 31, 2020
Apr. 20, 2020
Debt Instrument [Line Items]                          
Long-term debt outstanding   $ 241,360,000   $ 241,360,000         $ 115,000,000        
Long-term debt, percentage bearing annual interest rate   3.347%   3.347%                  
Amount of borrowings   $ 360,100,000   $ 360,100,000                  
Repayments of borrowings       $ 233,700,000                  
Averaged interest rate on borrowings   3.33% 2.55% 3.36% 3.07%                
Commitment fees on borrowings   $ 200,000 $ 100,000 $ 400,000 $ 300,000                
Amortization of deferred financing costs   200,000 100,000 339,000 161,000                
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]                          
Current borrowing base under EEH credit agreement                   $ 360,000,000.0 $ 240,000,000.0   $ 475,000,000
Credit agreement, covenant, current ratio 1.0                        
Credit agreement, covenant, leverage ratio 3.5                        
Long-term debt outstanding   241,400,000   241,400,000         $ 115,000,000.0        
Additional borrowing base available under credit agreement   233,600,000   233,600,000                  
Capitalized costs associated with borrowings   $ 800,000 $ 0 $ 1,800,000 $ 0                
EEH Credit Agreement | Subsequent Event                          
Debt Instrument [Line Items]                          
Current borrowing base under EEH credit agreement               $ 550,000,000          
EEH Credit Agreement | Minimum                          
Debt Instrument [Line Items]                          
Applicable margin percentage 1.50%                        
Commitment fee percentage 0.375%                        
EEH Credit Agreement | Maximum                          
Debt Instrument [Line Items]                          
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%