| Revenue from External Customers by Geographic Areas |
The following table summarizes net sales by end market: | | | | | | | | | | | | | | | | | | | | | | | | | | | | (in thousands) | | For the Three Months Ended September 30, | | For the Nine Months Ended September 30, | | End Market | | 2020 | | 2019 | | 2020 | | 2019 | | Energy | | $ | 33,813 | | | $ | 64,331 | | | $ | 113,546 | | | $ | 162,224 | | | Industrial | | 29,843 | | | 37,020 | | | 97,437 | | | 142,267 | | | Transportation | | 50,794 | | | 37,161 | | | 101,620 | | | 88,492 | | | Total | | $ | 114,450 | | | $ | 138,512 | | | $ | 312,603 | | | $ | 392,983 | |
The following table summarizes net sales by geographic area: | | | | | | | | | | | | | | | | | | | | | | | | | | | | (in thousands) | | For the Three Months Ended September 30, | | For the Nine Months Ended September 30, | | Geographic Area | | 2020 | | 2019 | | 2020 | | 2019 | | North America | | $ | 104,840 | | | $ | 125,971 | | | $ | 281,339 | | | $ | 343,593 | | | Pacific Rim | | 5,466 | | | 6,744 | | | 18,215 | | | 30,173 | | | Europe | | 2,395 | | | 4,329 | | | 7,630 | | | 12,712 | | | Other | | 1,749 | | | 1,468 | | | 5,419 | | | 6,505 | | | Total | | $ | 114,450 | | | $ | 138,512 | | | $ | 312,603 | | | $ | 392,983 | |
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| Schedule of Contract Balances |
| | | | | | | | | | | | | | | | (in thousands) | | As of September 30, 2020 | | As of December 31, 2019 | Short-term contract assets (included in Prepaid expenses and other current assets) | | $ | 8,601 | | | $ | 694 | | | | | | | Short-term contract liabilities (included in Other accrued liabilities) | | (52,502) | | | (26,898) | | Long-term contract liabilities (included in Noncurrent contract liabilities) | | (10,009) | | | (17,998) | | | Net contract liabilities | | $ | (53,910) | | | $ | (44,202) | |
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