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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts | TERADYNE, INC. SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |  |  | Column F |
Description |  | Balance at Beginning of Period |  |  | Additions Charged to Cost and Expenses |  |  | Other |  |  | Deductions |  |  | Balance at End of Period |
|  | (in thousands) |
Valuation reserve deducted in the balance sheet from the asset to which it applies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Allowance for doubtful accounts |  | $ | 2,356 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 141 |  |  | $ | 2,219 |
2016 Allowance for doubtful accounts |  | $ | 2,407 |  |  | $ | — |  |  | $ | — |  |  | $ | 51 |  |  | $ | 2,356 |
2015 Allowance for doubtful accounts |  | $ | 2,491 |  |  | $ | — |  |  | $ | — |  |  | $ | 84 |  |  | $ | 2,407 |
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |  |  | Column F |
Description |  | Balance at Beginning of Period |  |  | Additions Charged to Cost and Expenses |  |  | Other |  |  | Deductions |  |  | Balance at End of Period |
|  | (in thousands) |
Valuation reserve deducted in the balance sheet from the asset to which it applies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Inventory reserve |  | $ | 116,016 |  |  | $ | 8,844 |  |  | $ | (126 | ) |  | $ | 21,838 |  |  | $ | 102,896 |
2016 Inventory reserve |  | $ | 119,376 |  |  | $ | 17,493 |  |  | $ | 4,417 |  |  | $ | 25,270 |  |  | $ | 116,016 |
2015 Inventory reserve |  | $ | 111,252 |  |  | $ | 21,332 |  |  | $ | 1,680 |  |  | $ | 14,888 |  |  | $ | 119,376 |
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |  |  | Column F |
Description |  | Balance at Beginning of Period |  |  | Additions Charged to Cost and Expenses |  |  | Other |  |  | Deductions |  |  | Balance at End of Period |
|  | (in thousands) |
Valuation reserve deducted in the balance sheet from the asset to which it applies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Valuation allowance |  | $ | 48,369 |  |  | $ | 15,571 |  |  | $ | — |  |  | $ | 21 |  |  | $ | 63,919 |
2016 Valuation allowance |  | $ | 43,039 |  |  | $ | 5,413 |  |  | $ | — |  |  | $ | 83 |  |  | $ | 48,369 |
2015 Valuation allowance |  | $ | 41,737 |  |  | $ | 1,322 |  |  | $ | — |  |  | $ | 20 |  |  | $ | 43,039 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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Namespace Prefix: | us-gaap_
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