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Supplementary Balance Sheet Detail
 12 Months Ended
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]  
Supplementary Balance Sheet Detail
Supplementary Balance Sheet Detail

The following tables present supplementary balance sheet details:
 
As of
December 31, 2018
 
As of
December 31, 2017
 
(Dollars in thousands)
Inventories:
 
 
 
   Raw materials and supplies
$
99,935

 
$
39,434

   Work in process
125,767

 
85,852

   Finished goods
68,015

 
48,865

 
$
293,717

 
$
174,151

Prepaid expenses and other current assets:
 
 
 
   Prepaid expenses
$
10,720

 
$
9,505

   Value added tax and other indirect taxes receivable
19,242

 
18,627

   Spare parts inventory
11,507

 
11,010

   Other current assets
4,699

 
5,730

 
$
46,168

 
$
44,872

Property, plant and equipment:
 
 
 
   Land and improvements
$
45,947

 
$
46,599

   Buildings
68,680

 
59,608

   Machinery and equipment and other
532,084

 
495,069

   Construction in progress
42,131

 
41,375

 
$
688,842

 
$
642,651

Other accrued liabilities:
 
 
 
   Payrolls (including incentive programs)
$
17,284

 
$
14,196

   Employee benefits
6,977

 
4,684

   Deferred Revenue
5,380

 
20,784

   Other
20,811

 
13,562

 
$
50,452

 
$
53,226

Other long term obligations:
 
 
 
   Postretirement benefits
$
16,192

 
$
20,508

   Pension and related benefits
33,718

 
36,116

   Other
22,609

 
12,283

 
$
72,519

 
$
68,907


The following table presents an analysis of the allowance for doubtful accounts:
 
2018
 
2017
 
2016
 
 
 
 
Balance at beginning of year
$
1,097

 
$
326

 
$
244

Additions
122

 
771

 
129

Deductions
(90
)
 
—

 
(47
)
Balance at end of year
$
1,129

 
$
1,097

 
$
326