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Derivative Instruments (Tables)
6 Months Ended
Jun. 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 June 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 June 30, 2020(Dollars in thousands)
Derivatives designated as cash flow hedges:
Commodity derivative contractsPrepaid and other current assets$—  Other accrued liabilities$6,733  
Other long-term assets—  Other long-term obligations7,312  
Interest rate swap contractsPrepaid and other current assets—  Other accrued liabilities5,914  
Other long-term assets—  Other long-term obligations8,215  
Total fair value$—  $28,174  
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 June 30, 2020(Dollars in thousands)
Derivatives not designated as hedges:
Foreign currency derivativesPrepaid and other current assets$166  Other current liabilities$190  
Commodity derivatives contractsPrepaid and other current assets294  Other accrued liabilities—  
$460  $190  
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  $81  
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location
  Amount of (Gain)/Loss
Recognized
Location of (Gain)/Loss Recognized in the Consolidated Statement of OperationsFor the Three Months Ended June 30,
20202019
Derivatives designated as cash flow hedges:(Dollars in thousands)
Commodity derivative contractsCost of sales$(1,130) $(2,000) 
Interest rate swapInterest expense1,521  —  
Derivatives not designated as hedges:
Foreign currency derivativesCost of sales, Other (income) expense$(217) (144) 
Commodity derivative contractsCost of sales25  —  
  Amount of (Gain)/Loss
Recognized
Location of (Gain)/Loss Recognized in the Consolidated Statement of OperationsFor the Six Months Ended June 30,
20202019
Derivatives designated as cash flow hedges:(Dollars in thousands)
Commodity contract hedgesCost of sales$(3,939) (3,848) 
Interest rate swap contractsInterest expense1,315  —  
Derivatives not designated as hedges:
Foreign currency derivativesCost of sales, Other (income) expense$(716) (821) 
Commodity derivative contractsCost of sales(114) —