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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill by reportable segments for the years ended December 31, 2017 and 2016 are as follows:
|  | Industrial Automation |  |  | System Test |  |  | Wireless Test |  |  | Semiconductor Test |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 214,975 |  |  | $ | 158,699 |  |  | $ | 361,819 |  |  | $ | 260,540 |  |  | $ | 996,033 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (98,897 | ) |  |  | (260,540 | ) |  |  | (507,620 | )
|  |  | 214,975 |  |  |  | 10,516 |  |  |  | 262,922 |  |  |  | — |  |  |  | 488,413 |
Foreign currency translation adjustment |  |  | (10,124 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (10,124 | )
Goodwill impairment losses |  |  | — |  |  |  | — |  |  |  | (254,946 | ) |  |  | — |  |  |  | (254,946 | )
Balance at December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 204,851 |  |  |  | 158,699 |  |  |  | 361,819 |  |  |  | 260,540 |  |  |  | 985,909 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (762,566 | )
|  |  | 204,851 |  |  |  | 10,516 |  |  |  | 7,976 |  |  |  | — |  |  |  | 223,343 |
Foreign currency translation adjustment |  |  | 28,668 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 28,668 |
Balance at December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 233,519 |  |  |  | 158,699 |  |  |  | 361,819 |  |  |  | 260,540 |  |  |  | 1,014,577 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (762,566 | )
|  | $ | 233,519 |  |  | $ | 10,516 |  |  | $ | 7,976 |  |  | $ | — |  |  | $ | 252,011 |
Schedule of Estimated Intangible Assets Amortization Expense | Estimated intangible assets amortization expense for each of the five succeeding fiscal years is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2018 |  | $ | 29,496 |
2019 |  |  | 25,533 |
2020 |  |  | 11,249 |
2021 |  |  | 3,732 |
2022 |  |  | 2,927 |
Thereafter |  |  | 6,151 |
Wireless Test |
Schedule of Amortizable Intangible Assets | Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheets:
|  | December 31, 2017 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Developed technology |  | $ | 270,877 |  |  | $ | (226,190 | ) |  | $ | 1,618 |  |  | $ | 46,305 |
Customer relationships |  |  | 92,741 |  |  |  | (83,585 | ) |  |  | 171 |  |  |  | 9,327 |
Tradenames and trademarks |  |  | 50,100 |  |  |  | (27,120 | ) |  |  | 416 |  |  |  | 23,396 |
Non-compete agreement |  |  | 320 |  |  |  | (260 | ) |  |  | — |  |  |  | 60 |
Total intangible assets |  | $ | 414,038 |  |  | $ | (337,155 | ) |  | $ | 2,205 |  |  | $ | 79,088 |
|  | December 31, 2016 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Developed technology |  | $ | 270,877 |  |  | $ | (206,376 | ) |  | $ | (5,093 | ) |  | $ | 59,408 |
Customer relationships |  |  | 92,741 |  |  |  | (76,707 | ) |  |  | (538 | ) |  |  | 15,496 |
Tradenames and trademarks |  |  | 50,100 |  |  |  | (23,435 | ) |  |  | (1,308 | ) |  |  | 25,357 |
Non-compete agreement |  |  | 320 |  |  |  | (180 | ) |  |  | — |  |  |  | 140 |
Total intangible assets |  | $ | 414,038 |  |  | $ | (306,698 | ) |  | $ | (6,939 | ) |  | $ | 100,401 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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