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Operating Segment, Geographic and Significant Customer Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Information | Segment information for the years ended December 31, 2017, 2016, and 2015 is as follows:
|  | Semiconductor Test |  |  | System Test |  |  | Industrial Automation |  |  | Wireless Test |  |  | Corporate And Eliminations |  |  | Consolidated |
|  | (in thousands) |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 1,662,549 |  |  | $ | 192,135 |  |  | $ | 170,056 |  |  | $ | 111,866 |  |  | $ | — |  |  | $ | 2,136,606 |
Income (loss) before taxes (1)(2) |  |  | 491,361 |  |  |  | 10,306 |  |  |  | 8,763 |  |  |  | 17,350 |  |  |  | (3,368 | ) |  |  | 524,412 |
Total assets (3) |  |  | 597,480 |  |  |  | 97,018 |  |  |  | 368,037 |  |  |  | 59,912 |  |  |  | 1,987,098 |  |  |  | 3,109,545 |
Property additions |  |  | 87,920 |  |  |  | 5,976 |  |  |  | 7,044 |  |  |  | 4,435 |  |  |  | — |  |  |  | 105,375 |
Depreciation and amortization expense |  |  | 58,901 |  |  |  | 6,646 |  |  |  | 25,711 |  |  |  | 5,392 |  |  |  | 11,425 |  |  |  | 108,075 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 1,368,169 |  |  | $ | 189,846 |  |  | $ | 99,031 |  |  | $ | 96,204 |  |  | $ | — |  |  | $ | 1,753,250 |
Income (loss) before taxes (1)(2) |  |  | 311,939 |  |  |  | 28,916 |  |  |  | (16,783 | ) |  |  | (371,409 | ) |  |  | (7,723 | ) |  |  | (55,060 | )
Total assets (3) |  |  | 557,546 |  |  |  | 110,361 |  |  |  | 317,635 |  |  |  | 62,366 |  |  |  | 1,714,585 |  |  |  | 2,762,493 |
Property additions |  |  | 70,543 |  |  |  | 3,788 |  |  |  | 6,755 |  |  |  | 4,186 |  |  |  | — |  |  |  | 85,272 |
Depreciation and amortization expense |  |  | 58,087 |  |  |  | 6,551 |  |  |  | 26,869 |  |  |  | 25,921 |  |  |  | 2,581 |  |  |  | 120,009 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 1,201,530 |  |  | $ | 211,584 |  |  | $ | 41,892 |  |  | $ | 184,572 |  |  | $ | — |  |  | $ | 1,639,578 |
Income (loss) before taxes (1)(2) |  |  | 260,154 |  |  |  | 25,101 |  |  |  | (7,574 | ) |  |  | (13,830 | ) |  |  | (10,727 | ) |  |  | 253,124 |
Total assets (3) |  |  | 610,869 |  |  |  | 102,547 |  |  |  | 344,260 |  |  |  | 427,880 |  |  |  | 1,063,118 |  |  |  | 2,548,674 |
Property additions |  |  | 79,052 |  |  |  | 6,228 |  |  |  | 1,465 |  |  |  | 3,133 |  |  |  | — |  |  |  | 89,878 |
Depreciation and amortization expense |  |  | 64,415 |  |  |  | 4,391 |  |  |  | 14,500 |  |  |  | 53,440 |  |  |  | 4,027 |  |  |  | 140,773 |
(1) | Included in Corporate and Eliminations are: contingent consideration adjustments, pension and postretirement plans actuarial gains (losses), severance charges, impairment of fixed assets and expenses related to the Japan earthquake, property insurance recovery, interest income, interest expense, net foreign exchange gains (losses), and gain from the sale of an equity investment.
(2) | Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges, goodwill impairment charges and an acquired intangible assets impairment charge.
(3) | Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.
Revenues by Country | Information as to Teradyne’s revenues by country is as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Revenues from customers (1): |  |  |  |  |  |  |  |  |  |  |  |
Taiwan |  | $ | 687,031 |  |  | $ | 653,076 |  |  | $ | 436,389 |
China |  |  | 260,451 |  |  |  | 174,876 |  |  |  | 264,898 |
United States |  |  | 252,516 |  |  |  | 221,948 |  |  |  | 217,386 |
Korea |  |  | 206,819 |  |  |  | 147,882 |  |  |  | 120,224 |
Japan |  |  | 169,093 |  |  |  | 135,978 |  |  |  | 128,228 |
Europe |  |  | 163,715 |  |  |  | 117,671 |  |  |  | 111,903 |
Malaysia |  |  | 124,048 |  |  |  | 103,472 |  |  |  | 76,707 |
Philippines |  |  | 105,850 |  |  |  | 54,705 |  |  |  | 96,103 |
Singapore |  |  | 101,085 |  |  |  | 73,172 |  |  |  | 105,216 |
Thailand |  |  | 29,566 |  |  |  | 43,097 |  |  |  | 59,104 |
Rest of the World |  |  | 36,432 |  |  |  | 27,373 |  |  |  | 23,420 |
|  | $ | 2,136,606 |  |  | $ | 1,753,250 |  |  | $ | 1,639,578 |
(1) | Revenues attributable to a country are based on location of customer site.
Long-Lived Assets by Geographic Area | Long-lived assets by geographic area:
|  | United States |  |  | Foreign(1) |  |  | Total |
|  | (in thousands) |
December 31, 2017 |  | $ | 198,855 |  |  | $ | 69,592 |  |  | $ | 268,447 |
December 31, 2016 |  | $ | 189,195 |  |  | $ | 64,626 |  |  | $ | 253,821 |
(1) | As of December 31, 2017 and 2016, long-lived assets attributable to Singapore were $23.6 million and $31.5 million, respectively.
Wireless Test |
Schedule of Segment Reporting Information by Segment Charges | Included in the Wireless Test segment are charges in the following accounts:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Cost of revenues—inventory charge |  | $ | 2,190 |  |  | $ | 7,207 |  |  | $ | 2,500 |
Restructuring and other—lease impairment |  |  | 973 |  |  |  | — |  |  |  | — |
Restructuring and other—employee severance |  |  | — |  |  |  | 2,650 |  |  |  | — |
Goodwill impairment charge |  |  | — |  |  |  | 254,946 |  |  |  | — |
Intangible assets impairment charge |  |  | — |  |  |  | 83,339 |  |  |  | — |
System Test |
Schedule of Segment Reporting Information by Segment Charges | Included in the System Test segment are charges and credits in the following accounts:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Cost of revenues—inventory charge |  | $ | 1,918 |  |  | $ | 630 |  |  | $ | 8,324 |
Restructuring and other—employee severance |  |  | — |  |  |  | (49 | ) |  |  | 1,037 |
Semiconductor Test |
Schedule of Segment Reporting Information by Segment Charges | Included in the Semiconductor Test segment are charges in the following accounts:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Cost of revenues—inventory charge |  | $ | 4,606 |  |  | $ | 9,656 |  |  | $ | 10,508 |
Restructuring and other—employee severance |  |  | 1,779 |  |  |  | 2,860 |  |  |  | 499 |
Restructuring and other—impairment of fixed assets |  |  | 1,124 |  |  |  | — |  |  |  | — |
Corporate And Eliminations |
Schedule of Segment Reporting Information by Segment Charges | Included in the Corporate and Eliminations segment are charges and credits in the following accounts:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Restructuring and other—Universal Robots contingent consideration adjustment |  | $ | 7,820 |  |  | $ | 15,346 |  |  | $ | 5,339 |
Restructuring and other—impairment of fixed assets and expenses related to Japan earthquake |  |  | 755 |  |  |  | 5,051 |  |  |  | — |
Restructuring and other—employee severance |  |  | 530 |  |  |  | — |  |  |  | — |
Restructuring and other—property insurance recovery |  |  | (5,064 | ) |  |  | (5,051 | ) |  |  | — |
Cost of revenues—pension actuarial (gains) losses |  |  | (2,752 | ) |  |  | (1,025 | ) |  |  | 8,271 |
Engineering and development—pension actuarial (gains) losses |  |  | (2,456 | ) |  |  | (1,234 | ) |  |  | 4,658 |
Selling and administrative—pension actuarial (gains) losses |  |  | (1,416 | ) |  |  | (944 | ) |  |  | 4,826 |
Restructuring and other—ZTEC contingent consideration adjustment |  |  | — |  |  |  | — |  |  |  | (1,600 | )
Restructuring and other—AIT contingent consideration adjustment |  |  | — |  |  |  | 550 |  |  |  | (1,250 | )
Restructuring and other—acquisition costs |  |  | — |  |  |  | — |  |  |  | 1,104 |
Other (income) expense, net—gain from the sale of an equity investment |  |  | — |  |  |  | — |  |  |  | (5,406 | )
Industrial Automation |
Schedule of Segment Reporting Information by Segment Charges | Included in the Industrial Automation segment are charges in the following accounts:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Restructuring and other—employee severance |  | $ | 1,414 |  |  | $ | 585 |  |  | $ | — |
Cost of revenues—inventory step-up (1) |  |  | — |  |  |  | — |  |  |  | 1,567 |
(1) | Included in the cost of revenues for the year ended December 31, 2015 is the cost for purchase accounting inventory step-up.

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