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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Gains or losses on derivative instruments, statement of income      
Ineffectiveness - amount of gain (loss) recognized in income on related hedged items $ 85 $ (3) $ (191)
Gain (loss) excluded from hedge effectiveness testing 2,700 (938) $ (652)
Cash flow hedges resulted in net gains 544    
Net gains reclassified 149    
Net Gains (Losses) On Derivative Instruments Expected To Be Reclassified $ 395    
Period Within Which The Company Expects To Reclassify Net Gains On Derivative Instruments From A O C I to Earnings 12 months    
Commodity contract | Other current assets | Futures      
Commodity contract commitments      
Fair value of derivatives including required margin deposits $ 4,900 $ 5,600