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Significant Accounting Policies (Details) - USD ($)
9 Months Ended
Jan. 01, 2018
Sep. 30, 2018
Dec. 31, 2017
Minimum [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Payment of commodities due period   10 days  
Maximum [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Payment of commodities due period   30 days  
Accounting Standards Update 2017-12 [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Effect on retained earnings $ 0    
Derivative hedge accumulated ineffectiveness     $ 0
Accounting Standards Update 2018 02 [Member] | Retained Earnings (Accumulated Deficit) [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Reclassification from AOCI to retained earnings $ 5,200,000