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Contingencies (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Loss Contingency [Abstract] |  |
Schedule Of Product Warranties Accrual | Claims accrued but not yet paid and the related activity within the accrual for the six months ended June 30, 2018, are presented below:
| (Dollars in thousands)
Balance as of December 31, 2017 | $ | 349 |
Product warranty accruals and adjustments | 1,256 |
Settlements | (88 | )
Balance as of June 30, 2018 | $ | 1,517 |
​ | ​ | ​ | ​
|  | (Dollars in thousands) |
​ | ​ | ​ | ​
Balance as of December 31, 2015 |  | $ | 388 |
Product warranty charges/adjustments |  | 1,285 |
Payments and settlements |  | (704 | )
​ | ​ | ​ | ​
Balance as of December 31, 2016 |  | $ | 969 |
Product warranty charges/adjustments |  | (149 | )
Payments and settlements |  | (471 | )
​ | ​ | ​ | ​
Balance as of December 31, 2017 |  | $ | 349 |
​ | ​ | ​ | ​

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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