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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 | Schedule II — Valuation and Qualifying Accounts (in thousands)
Column A |  | Column B |  | Column C |  | Column D |  | Column E
|  |  |  | Additions |  |  |  |
|  |  |  | (1) |  | (2) |  |  |  |
|  | Balance at the Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  |  |  | Balance at End of Period
Description |  |  |  |  | -Deductions- |
|  |  |  |  |  | Note (A) |  | Note (B) |  |
Accounts receivable — allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2017 |  | $ | 14,234 |  |  | $ | 1,403 |  |  | $ | 1,005 |  |  | $ | 1,093 |  |  | $ | 15,549 |
Year ended December 31, 2016 |  | $ | 14,435 |  |  | $ | 1,087 |  |  | $ | (760 | ) |  | $ | 528 |  |  | $ | 14,234 |
Year ended December 31, 2015 |  | $ | 15,961 |  |  | $ | 883 |  |  | $ | (2,302 | ) |  | $ | 107 |  |  | $ | 14,435 |
Deferred tax valuation allowance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2017 |  | $ | 10,730 |  |  | $ | 9,513 |  |  | $ | 72,170 |  |  | $ | 79,556 |  |  | $ | 12,857 |
Year ended December 31, 2016 |  | $ | 25,435 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,705 |  |  | $ | 10,730 |
Year ended December 31, 2015 |  | $ | 36,263 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,828 |  |  | $ | 25,435 |
_______________________________________ Note (A) For accounts receivable, amounts comprise currency translation adjustments. For deferred tax valuation allowance in 2017, 2016, and 2015, amounts relate primarily to changes in foreign tax credit carryforwards and R&D credit carryforwards. Note (B) For accounts receivable, amounts represent excess of uncollectible balances written off over recoveries of accounts previously written off. For deferred tax valuation allowance, the decrease in 2017, 2016, and 2015 relates primarily to decreases in foreign tax credit and R&D credit carryforwards.

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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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