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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative Financial Instruments [Abstract]          
Accumulated other comprehensive loss $ (10,913)   $ (10,913)   $ (11,064)
Gain or loss from discontinuing cash flow hedge treatment 0 $ 0 0 $ 0  
Gain or loss from discontinuing fair value hedge treatment 0 0 0 0  
Energy trading contracts, gain (loss) $ (900) $ 2,100 $ 2,100 $ 11,400