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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2013
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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Allowance for doubtful accounts |  | $ | 4,118 |  |  | $ | 69 |  |  | $ | — |  |  | $ | 1,275 | (1) |  | $ | 2,912 |
2012 Allowance for doubtful accounts |  | $ | 4,102 |  |  | $ | 78 |  |  | $ | — |  |  | $ | 62 |  |  | $ | 4,118 |
2011 Allowance for doubtful accounts |  | $ | 3,752 |  |  | $ | — |  |  | $ | 429 |  |  | $ | 79 |  |  | $ | 4,102 |
(1) | Based upon an improvement in the aging of accounts receivables in 2013, Teradyne reduced its allowance for doubtful accounts by approximately $1 million.
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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Inventory reserve |  | $ | 141,838 |  |  | $ | 16,592 |  |  | $ | 2,568 |  |  | $ | 45,141 |  |  | $ | 115,857 |
2012 Inventory reserve |  | $ | 123,512 |  |  | $ | 26,849 |  |  | $ | 5,353 |  |  | $ | 13,876 |  |  | $ | 141,838 |
2011 Inventory reserve |  | $ | 122,434 |  |  | $ | 11,601 |  |  | $ | 6,815 |  |  | $ | 17,338 |  |  | $ | 123,512 |

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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 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration