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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2021
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 June 30, 2021 and December 31, 2020, 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 June 30, 2021(Dollars in thousands)
Derivatives designated as cash flow hedges:
Commodity derivative contractsPrepaid and other current assets$12,791 Other accrued liabilities$— 
Other long-term assets— Other long-term obligations— 
Interest rate swap contractsPrepaid and other current assets— Other accrued liabilities844 
Other long-term assets2,775 Other long-term obligations— 
Total fair value$15,566 $844 
As of December 31, 2020
Derivatives designated as cash flow hedges:
Commodity derivative contractsPrepaid and other current assets$518 Other accrued liabilities$888 
Other long-term assets63 Other long-term obligations1,898 
Interest rate swap contractsPrepaid and other current assets— Other accrued liabilities4,080 
Other long-term assets— Other long-term obligations6,903 
Total fair value$581 $13,769 
    
 Asset DerivativesLiability Derivatives
 Location   Fair  ValueLocation   Fair  Value
As of June 30, 2021(Dollars in thousands)
Derivatives not designated as hedges:
Foreign currency derivativesPrepaid and other current assets$137 Other accrued liabilities$272 
Total fair value$137 $272 
As of December 31, 2020
Derivatives not designated as hedges:
Foreign currency derivativesPrepaid and other current assets$Other accrued liabilities$111 
Interest rate swap contractsPrepaid and other current assets— Other accrued liabilities952 
Total fair value$$1,063 
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 June 30, 2021 and 2020:
  Amount of (Gain)/Loss
Recognized
Location of Realized (Gain)/Loss Recognized in the Consolidated Statement of OperationsFor the Three Months Ended June 30,
20212020
Derivatives designated as cash flow hedges:(Dollars in thousands)
Commodity derivative contractsCost of sales$4,498 $(1,130)
Interest rate swap contractsInterest expense289 1,521 
Derivatives not designated as hedges:
Foreign currency derivativesCost of sales, Other expense (income)$264 $(217)
Commodity derivative contractsCost of sales(242)25 
  Amount of (Gain)/Loss
Recognized
Location of (Gain)/Loss Recognized in the Consolidated Statement of OperationsFor the Six Months
Ended June 30,
20212020
Derivatives designated as cash flow hedges:(Dollars in thousands)
Commodity contract hedgesCost of sales$5,047 $(3,939)
Interest rate swap contractsInterest expense1,285 1,315 
Derivatives not designated as hedges:
Foreign currency derivativesCost of sales, Other expense (income)$1,893 $(716)
Commodity derivative contractsCost of sales(242)(114)
Interest rate swap contractsInterest expense866 —