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Derivative Instruments (Tables)
9 Months Ended
Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The fair value of all derivatives is recorded as assets or liabilities on a gross basis in our Condensed Consolidated Balance Sheets. As of September 30, 2020 and December 31, 2019, the fair value of our derivatives and their respective balance sheet locations are presented in the following tables:
Asset DerivativesLiability Derivatives
 Location   Fair  ValueLocation   Fair  Value
As of September 30, 2020(Dollars in thousands)
Derivatives designated as cash flow hedges:
Commodity derivative contractsPrepaid and other current assets$Other accrued liabilities$4,653 
Other long-term assets— Other long-term obligations4,261 
Interest rate swap contractsPrepaid and other current assets— Other accrued liabilities5,730 
Other long-term assets— Other long-term obligations7,609 
Total fair value$$22,253 
As of December 31, 2019
Derivatives designated as cash flow hedges:
Commodity derivative contractsPrepaid and other current assets$104 Other accrued liabilities$1,872 
Other long-term assets369 Other long-term obligations2,255 
Interest rate swap contractsPrepaid and other current assets253 Other accrued liabilities— 
Other long-term assets2,684 Other long-term obligations72 
Total fair value$3,410 $4,199 
    
 Asset DerivativesLiability Derivatives
 Location   Fair  ValueLocation   Fair  Value
As of September 30, 2020(Dollars in thousands)
Derivatives not designated as hedges:
Foreign currency derivativesPrepaid and other current assets$817 Other current liabilities$161 
Commodity derivatives contractsPrepaid and other current assets165 Other accrued liabilities— 
$982 $161 
As of December 31, 2019
Derivatives not designated as hedges:
Foreign currency derivativesPrepaid and other current assets$239 Other current liabilities$81 
Commodity derivatives contractsPrepaid and other current assets376 Other accrued liabilities— 
$615 $81 
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location
The location and amount of realized (gains) losses on derivatives are recognized in the Statements of Operations as follows for the periods ended September 30, 2020 and 2019:
  Amount of (Gain)/Loss
Recognized
Location of (Gain)/Loss Recognized in the Consolidated Statement of OperationsFor the Three Months Ended September 30,
20202019
Derivatives designated as cash flow hedges:(Dollars in thousands)
Commodity derivative contractsCost of sales$(1,295)$(3,145)
Interest rate swapInterest expense1,537 (323)
Derivatives not designated as hedges:
Foreign currency derivativesCost of sales, Other (income) expense$(243)$173 
Commodity derivative contractsCost of sales(207)— 
  Amount of (Gain)/Loss
Recognized
Location of (Gain)/Loss Recognized in the Consolidated Statement of OperationsFor the Nine Months Ended September 30,
20202019
Derivatives designated as cash flow hedges:(Dollars in thousands)
Commodity contract hedgesCost of sales$(5,234)$(6,994)
Interest rate swap contractsInterest expense2,852 (323)
Derivatives not designated as hedges:
Foreign currency derivativesCost of sales, Other (income) expense$(959)$(648)
Commodity derivative contractsCost of sales(321)—