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Derivative Accounting - Derivative Instruments in the Balance Sheets (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Assets    
Gross Recognized Derivatives $ 17,304,000 $ 515,000
Liabilities    
Amount Reported on Balance Sheets (13,358,000) (72,132,000)
Commodity Contracts    
Assets    
Gross Recognized Derivatives 20,513,000  
Amounts Offset (3,209,000)  
Net Recognized Derivatives 17,304,000  
Other 0 405,000
Amount Reported on Balance Sheets 17,304,000  
Liabilities    
Gross Recognized Derivatives (15,282,000) (71,421,000)
Amounts Offset 3,209,000 474,000
Net Recognized Derivatives (12,073,000) (70,947,000)
Other (1,285,000) (1,185,000)
Amount Reported on Balance Sheets (13,358,000) (72,132,000)
Assets and Liabilities    
Gross Recognized Derivatives 5,231,000 (70,837,000)
Amounts Offset 0 0
Net Recognized Derivatives 5,231,000 (70,837,000)
Other (1,285,000) (780,000)
Amount Reported on Balance Sheets 3,946,000 (71,617,000)
Cash collateral received from counterparties 1,285,000 1,185,000
Commodity Contracts | Current assets    
Assets    
Gross Recognized Derivatives 15,505,000 584,000
Amounts Offset (1,630,000) (474,000)
Net Recognized Derivatives 13,875,000 110,000
Other 0 405,000
Amount Reported on Balance Sheets 13,875,000 515,000
Commodity Contracts | Investments and other assets    
Assets    
Gross Recognized Derivatives 5,008,000  
Amounts Offset (1,579,000)  
Net Recognized Derivatives 3,429,000  
Other 0  
Amount Reported on Balance Sheets 3,429,000  
Commodity Contracts | Current liabilities    
Liabilities    
Gross Recognized Derivatives (4,611,000) (38,235,000)
Amounts Offset 1,630,000 474,000
Net Recognized Derivatives (2,981,000) (37,761,000)
Other (1,285,000) (1,185,000)
Amount Reported on Balance Sheets (4,266,000) (38,946,000)
Assets and Liabilities    
Cash collateral received from counterparties 1,285,000 1,185,000
Commodity Contracts | Deferred credits and other    
Liabilities    
Gross Recognized Derivatives (10,671,000) (33,186,000)
Amounts Offset 1,579,000 0
Net Recognized Derivatives (9,092,000) (33,186,000)
Other 0 0
Amount Reported on Balance Sheets (9,092,000) (33,186,000)
Assets and Liabilities    
Cash collateral received from counterparties $ 0 $ 0