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Schedule II - Valuation and Qualifying Accounts Schedule II Valuation and Qualifying Accounts (Notes) | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | Schedule II -Valuation and Qualifying Accounts The roll forward of valuation accounts were as follows:
| (Dollars in thousands)
Description | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Deductions |  | Balance at End of Period
Allowance for doubtful accounts: |  |  |  |  |  |  |
Year ended December 31, 2018 | $ | 476 |  |  | $ | 695 |  |  | $ | (622 | ) |  | $ | 549 |
Year ended December 31, 2017 | $ | 454 |  |  | $ | 499 |  |  | $ | (477 | ) |  | $ | 476 |
Valuation allowance for deferred tax assets: |  |  |  |  |  |  |
Year ended December 31, 2018 | $ | 2,556 |  |  | $ | 13 |  |  | $ | — |  |  | $ | 2,569 |
Year ended December 31, 2017 | $ | 35,416 |  |  | $ | (32,860 | ) |  | $ | — |  |  | $ | 2,556 |
(1) | Uncollected receivables written off, net of recoveries and translation adjustments.

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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