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Fair Value Measurements And Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location At December 31, 2021 and 2020, the fair value of our derivatives and their respective balance sheet locations are presented in the following table:
Asset DerivativesLiability Derivatives
 LocationFair  ValueLocationFair  Value
As of December 31, 2021
(Dollars in thousands)
Derivatives designated as cash flow hedges:
Commodity derivative contractsPrepaid and other current assets$8,469 Other accrued liabilities$— 
Other assets— Other long-term obligations— 
Interest rate swap contractsPrepaid and other current assets$— Other accrued liabilities$140 
Other assets6,060 Other long-term obligations— 
Total fair value$14,529 $140 
As of December 31, 2020
Commodity derivative contractsPrepaid and other current assets$518 Other accrued liabilities$888 
Other assets63 Other long-term obligations1,898 
Interest rate swap contractsPrepaid and other current assets$— Other accrued liabilities$4,080 
Other assets— Other long-term obligations6,903 
Total fair value$581 $13,769 
Derivatives Not Designated as Hedging Instruments
 Asset DerivativesLiability Derivatives
 LocationFair  ValueLocationFair  Value
As of December 31, 2021
(Dollars in Thousands)
Derivatives not designated as hedges:
Foreign currency derivativesPrepaid and other current assets$388 Other accrued liabilities$2 
Total fair value$388 $2 
As of December 31, 2020
Derivatives not designated as hedges:
Foreign currency derivativesPrepaid and other current assets$6 Other accrued liabilities$111 
Interest rate swap contractsPrepaid and other current assets— Other accrued liabilities952 
Total fair value$6 $1,063 
Schedule Of Realized (Gains) Losses On Derivatives Recognized In Statement Of Operations The realized (gains) losses on derivatives are recognized in the Statements of Operations when the hedged item impacts earnings and are as follows for the years ended December 31, 2021, 2020 and 2019:
  Amount of (Gain)/Loss
Recognized
Location of Realized (Gain)/Loss Recognized in the Consolidated Statement of Operations202120202019
Derivatives designated as cash flow hedges:(Dollars in thousands)
Commodity derivative contractsCost of sales$6,440 $(4,134)$(8,892)
Interest rate swapsInterest expense (income)1,846 4,390 (1,050)
  Amount of (Gain)/Loss
Recognized
Location of Realized (Gain)/Loss Recognized in the Consolidated Statement of Operations202120202019
Derivatives not designated as hedges:(Dollars in thousands)
Foreign currency derivativesCost of sales, Other (income) expense, net$3,895 $(2,671)$(506)
Commodity derivative contractsCost of sales(1,399)(530)(223)
Interest rate swap contractsInterest expense866 — — 
Derivatives Not Designated as Hedging Instruments 2 The amount of the amortization is as follows for 2021:
  Amount of (Gain)/Loss
Recognized
Location of Realized (Gain)/Loss Recognized in the Consolidated Statement of Operations202120202019
Derivatives not designated as hedges:(Dollars in thousands)
Interest rate swap contractsInterest expense2,807 — —