Supplementary Balance Sheet Detail

The following tables present supplementary balance sheet details:



	At December 31,
	2015		2016
	(Dollars in thousands)

Inventories:
Raw materials and supplies	$	66,201	$	54,469
Work in process	89,453		52,379
Finished goods	62,476		49,263
	218,130		156,111
Prepaid expenses and other current assets:
Prepaid expenses	$	9,041	$	6,096
Value added tax and other indirect taxes receivable	10,069		12,984
Other current assets	2,040		2,585
	$	21,150	$	21,665
Property, plant and equipment:
Land and improvements	$	44,052	$	43,737
Buildings	55,843		55,440
Machinery and equipment and other	431,226		460,892
Construction in progress	40,208		25,635
	$	571,329	$	585,704
Other accrued liabilities:
Payrolls (including incentive programs)	$	4,028	$	4,802
Employee compensation and benefits	6,199		11,439
Other	10,760		14,278
	$	20,987	$	30,519
Other long term obligations:
Postretirement benefits	$	20,102	$	19,002
Pension and related benefits	55,364		45,876
Other	18,852		17,270
	$	94,318	$	82,148

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



	2014			For the Period January 1 through August 14, 2015			For the Period August 15 through December 31, 2015		2016
	(Dollars in thousands)
Balance at beginning of year	$	6,262		$	6,969		$	—	$	244
Additions	3,520			85			244		129
Deductions	(2,813		)	(1,177		)	—		(47		)
Balance at end of year	$	6,969		$	5,877		$	244	$	326