Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Schedule Of Available-for-sale Investments Measured At Fair Value on A Recurring Basis, Categorized By Level of Inputs Used In The Valuation

Available-for-sale investments measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, were as follows:

	Available-for-Sale Investment at Fair Value as of December 31, 2021
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Pension surplus investment(1)	$	6,638	$	—	$	—	$	6,638

	Available-for-Sale Investment at Fair Value as of December 31, 2020
	Level 1		Level 2		Level 3		Total(1)
Pension surplus investment(1)	$	6,706	$	2,400	$	—	$	9,106

(1) These balances were invested in funds comprised of short-term cash and fixed income securities, and was recorded in the “Other long-term assets” line item in the condensed consolidated statements of financial position. As of December 31, 2021 and 2020, the fair value of these investments approximated their carrying value.

Schedule of Derivative Instruments Measured At Fair Value on A Recurring Basis, Categorized By The Level of Inputs Used In The Valuation

Derivative instruments measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, include:

	Derivative Instruments at Fair Value as of December 31, 2021
(Dollars in thousands)	Level 1		Level 2		Level 3		Total(1)
Foreign currency contracts	$	—	$	(16)	$	—	$	(16)
Copper derivative contracts	$	—	$	1,344	$	—	$	1,344

	Derivative Instruments at Fair Value as of December 31, 2020
(Dollars in thousands)	Level 1		Level 2		Level 3		Total(1)
Foreign currency contracts	$	—	$	(130)	$	—	$	(130)
Copper derivative contracts	$	—	$	4,785	$	—	$	4,785

(1) All balances were recorded in the “Other current assets” or “Other accrued liabilities” line items in the consolidated statements of financial position.