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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Volume of Outstanding Commodity Contracts (Details) - Commodity contracts
6 Months Ended
Jun. 30, 2019
lb
Derivative [Line Items]  
Derivative, outstanding commodity contract 5,000,000
Minimum  
Derivative [Line Items]  
Derivative, term of contract 1 month
Maximum  
Derivative [Line Items]  
Derivative, term of contract 7 months