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Schedule II Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure | L. B. FOSTER COMPANY AND SUBSIDIARIES SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS FOR THE YEARS ENDED DECEMBER 31, 2017, 2016, AND 2015
|  | Balance at Beginning of Year |  | Additions Charged to Costs and Expenses |  | Deductions (1) |  | Balance at End of Year
2017 |  |  |  |  |  |  |  |
Deducted from assets to which they apply: |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,417 |  |  | $ | 1,517 |  |  | $ | 783 |  |  | $ | 2,151 |
Valuation allowance for deferred tax assets |  | $ | 29,719 |  |  | $ | — |  |  | $ | 6,023 |  |  | $ | 23,696 |
2016 |  |  |  |  |  |  |  |
Deducted from assets to which they apply: |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,485 |  |  | $ | 982 |  |  | $ | 1,050 |  |  | $ | 1,417 |
Valuation allowance for deferred tax assets |  | $ | — |  |  | $ | 29,719 |  |  | $ | — |  |  | $ | 29,719 |
2015 |  |  |  |  |  |  |  |
Deducted from assets to which they apply: |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,036 |  |  | $ | 1,113 |  |  | $ | 664 |  |  | $ | 1,485 |
(1) | Notes and accounts receivable written off as uncollectible.

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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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- References No definition available. + Details
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