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Segment Reporting
 12 Months Ended
Dec. 31, 2021
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 substantially all the needle coke that we produce internally to manufacture our graphite electrodes and as a result approximately 96% of our revenues from external customers are derived from the sale of graphite electrodes. In 2021, no customer accounted for more than 10% of our net sales.
The following tables summarize information as to our operations in different geographic areas:
202120202019
 (Dollars in thousands)
Net sales:
United States$285,710 $260,867 $403,916 
Americas (excluding the United States)241,442 187,779 348,670 
Asia Pacific154,084 127,415 172,439 
Europe, Middle East, Africa664,552 648,300 865,768 
Total$1,345,788 $1,224,361 $1,790,793 
 At December 31,
20212020
(Dollars in thousands)
Long-lived assets (a):
United States$179,003 $169,208 
Mexico123,997 132,867 
Brazil4,090 4,309 
France93,579 92,805 
Spain100,248 106,467 
Other countries556 561 
Total$501,473 $506,217 
(a)Long-lived assets represent fixed assets, net of accumulated depreciation.