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Segment Reporting
 12 Months Ended
Dec. 31, 2023
Segment Reporting Information, Revenue for Reportable Segment [Abstract]  
Segment Reporting Segment Reporting
Our Industrial Materials segment, our only reportable segment, manufactures high-quality graphite electrodes essential to the production of EAF steel and other ferrous and non-ferrous metals. Petroleum needle coke, a crystalline form of carbon derived from decant oil, is a key raw material used in the production of graphite electrodes. We utilize the majority of the needle coke that we produce internally to manufacture our graphite electrodes and as a result approximately 95% of our revenues from external customers are derived from the sale of graphite electrodes. No single customer accounted for 10% or more of the Company's net sales in 2023, 2022 or 2021.
The following tables summarize information as to the Company's operations in different geographic areas:
Year Ended December 31,
202320222021
 (Dollars in thousands)
Net sales:
United States$206,263 $340,793 $285,710 
Americas (excluding the United States)100,364 256,253 241,442 
Asia Pacific66,214 116,849 154,084 
Europe, Middle East, Africa247,659 567,355 664,552 
Total$620,500 $1,281,250 $1,345,788 
 December 31,
20232022
(Dollars in thousands)
Long-lived assets (a):
United States$196,847 $192,038 
Mexico117,414 124,024 
Brazil4,424 4,327 
France93,660 93,880 
Spain109,127 104,392 
Other countries642 485 
Total$522,114 $519,146 
(a)Long-lived assets represent fixed assets, net of accumulated depreciation.