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Long-Term Debt (Details) - USD ($)
12 Months Ended
Nov. 21, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Sep. 17, 2021
Sep. 16, 2021
Jul. 20, 2021
Jul. 19, 2021
Apr. 20, 2021
Apr. 19, 2021
Dec. 17, 2020
Dec. 16, 2020
Debt Instrument [Line Items]                        
Long-term debt   $ 320,000,000 $ 115,000,000                  
Long-term debt, percentage bearing annual interest rate   3.11%                    
Commitment fees on borrowings   $ 900,000 600,000 $ 700,000                
Amortization of deferred financing costs   856,000 322,000 $ 412,000                
EEH Credit Agreement                        
Debt Instrument [Line Items]                        
Current borrowing base under EEH credit agreement   650,000,000     $ 650,000,000 $ 550,000,000 $ 550,000,000 $ 475,000,000 $ 475,000,000 $ 360,000,000 $ 360,000,000 $ 240,000,000
Covenant terms, minimum current ratio 1.0                      
Covenant terms, maximum leverage ratio 3.5                      
Long-term debt   320,000,000 $ 115,000,000                  
Additional borrowing base available under credit agreement   330,000,000                    
Amount of borrowings   744,100,000                    
Repayments of borrowings   $ 539,100,000                    
Averaged interest rate on outstanding debt   3.40% 2.83% 4.42%                
Amortization of deferred financing costs   $ 900,000 $ 300,000 $ 400,000                
Capitalized costs associated with borrowings   $ 2,800,000 $ 0 $ 1,600,000                
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 3.25%                      
Commitment fee percentage 0.50%                      
EEH Credit Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                        
Debt Instrument [Line Items]                        
Applicable margin percentage 1.00%                      
EEH Credit Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum                        
Debt Instrument [Line Items]                        
Applicable margin percentage 2.50%                      
EEH Credit Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum                        
Debt Instrument [Line Items]                        
Applicable margin percentage 4.25%                      
EEH Credit Agreement | Federal Funds Rate                        
Debt Instrument [Line Items]                        
Applicable margin percentage 0.50%