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Long-Term Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
Nov. 21, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
May 31, 2024
May 31, 2023
Sep. 17, 2021
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   $ 278,253,000   $ 278,253,000           $ 115,000,000        
Amortization of deferred financing costs       581,000 $ 241,000                  
EEH Credit Agreement                            
Debt Instrument [Line Items]                            
Current borrowing base under EEH credit agreement               $ 650,000,000 $ 550,000,000   $ 360,000,000 $ 240,000,000   $ 475,000,000
Credit agreement, covenant, current ratio 1.0                          
Credit agreement, covenant, leverage ratio 3.5                          
Long-term debt outstanding   $ 278,300,000   $ 278,300,000           $ 115,000,000        
Long-term debt, percentage bearing annual interest rate   3.153%   3.153%                    
Additional borrowing base available under credit agreement   $ 371,700,000   $ 371,700,000                    
Amount of borrowings   $ 503,700,000   503,700,000                    
Repayments of borrowings       $ 340,500,000                    
Averaged interest rate on borrowings   3.66% 2.48% 3.47% 2.89%                  
Commitment fees on borrowings   $ 200,000 $ 200,000 $ 600,000 $ 500,000                  
Amortization of deferred financing costs   200,000 100,000 600,000 200,000                  
Capitalized costs associated with borrowings   $ 1,000,000 $ 0 $ 2,800,000 $ 0                  
Minimum | EEH Credit Agreement                            
Debt Instrument [Line Items]                            
Applicable margin percentage 1.50%                          
Commitment fee percentage 0.375%                          
Maximum | EEH Credit Agreement                            
Debt Instrument [Line Items]                            
Applicable margin percentage 2.75%                          
Commitment fee percentage 0.50%                          
London Interbank Offered Rate (LIBOR) | EEH Credit Agreement                            
Debt Instrument [Line Items]                            
Applicable margin percentage 1.00%                          
London Interbank Offered Rate (LIBOR) | Minimum | EEH Credit Agreement                            
Debt Instrument [Line Items]                            
Applicable margin percentage 2.50%                          
London Interbank Offered Rate (LIBOR) | Maximum | EEH Credit Agreement                            
Debt Instrument [Line Items]                            
Applicable margin percentage 3.75%                          
Federal Funds Rate | EEH Credit Agreement                            
Debt Instrument [Line Items]                            
Applicable margin percentage 0.50%                          
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