Schedule of Segment Reporting Information, by Segment [Table Text Block] |
| | 2019 | | | 2018 | | | 2017 | | Net sales by segment: | | | | | | | | | | | | | Semiconductor Test & Inspection | | $ | 540,878 | | | $ | 443,276 | | | $ | 352,704 | | PCB Test | | | 42,451 | | | | 8,492 | | | | - | | Total consolidated net sales for reportable segments | | $ | 583,329 | | | $ | 451,768 | | | $ | 352,704 | | Segment profit (loss) before tax: | | | | | | | | | | | | | Semiconductor Test & Inspection | | $ | (45,072 | ) | | $ | 2,489 | | | $ | 42,535 | | PCB Test | | | 2,635 | | | | (5,154 | ) | | | - | | Profit (loss) for reportable segments | | | (42,437 | ) | | | (2,665 | ) | | | 42,535 | | Other unallocated amounts: | | | | | | | | | | | | | Corporate expenses | | | (9,848 | ) | | | (25,457 | ) | | | (7,787 | ) | Interest expense | | | (20,556 | ) | | | (4,977 | ) | | | (54 | ) | Interest income | | | 764 | | | | 1,187 | | | | 671 | | Income (loss) from continuing operations before taxes | | $ | (72,077 | ) | | $ | (31,912 | ) | | $ | 35,365 | | | | 2019 | | | 2018 | | | 2017 | | Depreciation and amortization by segment deducted in arriving at profit (loss): | | | | | | | | | | | | | Semiconductor Test & Inspection | | $ | 56,621 | | | $ | 24,634 | | | $ | 9,195 | | PCB Test | | | 2,250 | | | | 1,413 | | | | - | | Total depreciation and amortization for reportable segments | | $ | 58,871 | | | $ | 26,047 | | | $ | 9,195 | | Capital expenditures by segment: | | | | | | | | | | | | | Semiconductor Test & Inspection | | $ | 17,831 | | | $ | 4,957 | | | $ | 6,093 | | PCB Test | | | 169 | | | | 10 | | | | - | | Total consolidated capital expenditures | | $ | 18,000 | | | $ | 4,967 | | | $ | 6,093 | | | | 2019 | | | 2018 | | | 2017 | | | | | | | | | | | | | | | Semiconductor Test & Inspection | | $ | 998,756 | | | $ | 1,038,053 | | | $ | 368,158 | | PCB Test | | | 56,938 | | | | 57,762 | | | | - | | Total assets for reportable segments | | | 1,055,694 | | | | 1,095,815 | | | | 368,158 | | Corporate, principally cash and investments | | | 18,398 | | | | 34,367 | | | | 52,299 | | Discontinued operations | | | 3,618 | | | | 3,820 | | | | - | | Total consolidated assets | | $ | 1,077,710 | | | $ | 1,134,002 | | | $ | 420,457 | |
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Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
| | 2019 | | | 2018 | | | 2017 | | China | | $ | 118,213 | | | $ | 90,255 | | | $ | 82,474 | | Malaysia | | | 61,826 | | | | 61,793 | | | | 80,102 | | United States | | | 71,963 | | | | 61,177 | | | | 38,729 | | Philippines | | | 51,683 | | | | 46,421 | | | | 26,268 | | Taiwan | | | 75,725 | | | | 25,074 | | | | 16,517 | | Rest of the World | | | 203,919 | | | | 167,048 | | | | 108,614 | | Total, net | | $ | 583,329 | | | $ | 451,768 | | | $ | 352,704 | |
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Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] |
| | 2019 | | | 2018 | | Property, plant and equipment: | | | | | | | | | Germany | | $ | 25,234 | | | $ | 21,655 | | United States | | | 16,671 | | | | 20,417 | | Japan | | | 9,964 | | | | 11,905 | | Malaysia | | | 7,151 | | | | 10,535 | | Philippines | | | 8,637 | | | | 5,842 | | Rest of the World | | | 3,255 | | | | 3,978 | | Total, net | | $ | 70,912 | | | $ | 74,332 | | | | | | | | | | | Goodwill and other intangible assets: | | | | | | | | | Germany | | $ | 228,476 | | | $ | 249,605 | | United States | | | 207,642 | | | | 228,022 | | Malaysia | | | 44,140 | | | | 43,569 | | Singapore | | | 13,915 | | | | 15,173 | | Switzerland | | | 8,190 | | | | 11,604 | | Japan | | | 3,872 | | | | 4,138 | | Rest of the World | | | 7,453 | | | | 8,977 | | Total, net | | $ | 513,688 | | | $ | 561,088 | |
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