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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2015
Property Plant and Equipment | Property, plant and equipment consist of the following:
|  | 2015 |  |  | 2014 |
|  | (in thousands) |
Land |  | $ | 16,561 |  |  | $ | 16,561 |
Buildings |  |  | 108,797 |  |  |  | 108,671 |
Machinery and equipment |  |  | 595,445 |  |  |  | 659,743 |
Furniture and fixtures, and software |  |  | 82,612 |  |  |  | 77,566 |
Leasehold improvements |  |  | 43,328 |  |  |  | 31,981 |
Construction in progress |  |  | 2,630 |  |  |  | 2,508 |
|  |  | 849,373 |  |  |  | 897,030 |
Less: accumulated depreciation |  |  | 575,959 |  |  |  | 567,992 |
|  | $ | 273,414 |  |  | $ | 329,038 |

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- Definition Schedule of Property, Plant and Equipment [Table Text Block] + References No definition available. + Details
Name: | ter_ScheduleOfPropertyPlantAndEquipmentTableTextBlock
Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration