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Derivative Financial Instruments (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Gains or losses on derivative instruments, statement of income          
Ineffectiveness - amount of gain (loss) recognized in income on related hedged items $ 2,400 $ 1,200,000 $ 59,000 $ 32,000  
Gain (loss) excluded from hedge effectiveness testing (1,200,000) 1,700,000 205,000 (519,000)  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax 480,000 88,000 491,000 147,000  
Net gains (loss) reclassified 236,000 $ 157,000 198,000 $ 440,000  
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months 284,000   $ 284,000    
Period Within Which The Company Expects To Reclassify Net Gains On Derivative Instruments From A O C I to Earnings     12 months    
Futures | Commodity contract | Other current assets          
Commodity contract commitments          
Fair value of derivatives including required margin deposits $ 3,100,000   $ 3,100,000   $ 3,700,000