Supplementary Balance Sheet Detail

12 Months Ended

Dec. 31, 2021

Balance Sheet Related Disclosures [Abstract]

The following tables present supplementary balance sheet details:


	As of December 31, 2021		As of December 31, 2020
	(Dollars in thousands)
Inventories:
Raw materials and supplies	$	132,113	$	101,098
Work in process	127,127		110,331
Finished goods	30,192		54,535
	$	289,432	$	265,964
Prepaid expenses and other current assets:
Prepaid expenses	$	8,193	$	9,242
Value-added tax and other indirect taxes receivable*	40,861		10,666
Spare parts inventory	12,408		11,825
Other current assets	11,902		3,381
	$	73,364	$	35,114
Property, plant and equipment:
Land and improvements	$	49,201	$	50,285
Buildings	79,660		80,041
Machinery and equipment and other	621,808		621,478
Construction in progress	64,629		33,098
	$	815,298	$	784,902
Other accrued liabilities:
Payrolls (including incentive programs)	$	16,904	$	13,159
Employee benefits	7,272		7,128
Deferred revenue	9,840		13,056
Other	22,389		23,158
	$	56,405	$	56,501
Other long-term obligations:
Post-employment benefits	$	14,597	$	15,669
Pension and related benefits	31,139		37,847
Other	22,921		27,962
	$	68,657	$	81,478

*Included in "Value-added tax and other indirect taxes receivable" is the recognition of the Brazil value-added tax credit of $11.5 million (see Note 16, "Other (Income) Expense, net").

The following table presents an analysis of the allowance for doubtful accounts:


	2021		2020		2019

Balance at beginning of year	$	8,243	$	5,474	$	1,129
Charge to retained earnings - ASC 326 adoption impact	—		2,026		—
(Credit) charge to income	(1,266)		1,458		4,636
Deductions	(142)		(715)		(291)
Balance at end of year	$	6,835	$	8,243	$	5,474