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Goodwill and other intangible assets (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Schedule Of Changes In The Carrying Value Of Goodwill | The following tables represent the changes in the carrying value of goodwill and intangibles for the six months ended June 30, 2018:
Goodwill
(Dollars in thousands)
Balance as of December 31, 2017 | $ | 171,117 |
Adjustments | — |
Balance as of June 30, 2018 | $ | 171,117 |
​ | ​ | ​ | ​
|  | Total |
​ | ​ | ​ | ​
|  | (Dollars in thousands) |
Balance as of December 31, 2015 |  | $ | 172,059 |
Adjustments (See Note 2) |  | 1,058 |
Goodwill transferred to discontinued operations |  | (2,000 | )
​ | ​ | ​ | ​
Balance as of December 31, 2016 |  | $ | 171,117 |
Adjustments |  | — |
​ | ​ | ​ | ​
Balance as of December 31, 2017 |  | $ | 171,117 |
​ | ​ | ​ | ​
Schedule Of Intangible Assets With Determinable Useful Lives By Major Category |
Intangible Assets
| As of June 30, 2018 |  | As of December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (Dollars in Thousands)
Trade name | $ | 22,500 |  |  | $ | (6,629 | ) |  | $ | 15,871 |  |  | $ | 22,500 |  |  | $ | (5,512 | ) |  | $ | 16,988 |
Technological know-how | 55,300 |  |  | (20,502 | ) |  | 34,798 |  |  | 55,300 |  |  | (17,265 | ) |  | 38,035 |
Customer –related intangible | 64,500 |  |  | (12,859 | ) |  | 51,641 |  |  | 64,500 |  |  | (10,637 | ) |  | 53,863 |
Total finite-lived intangible assets | $ | 142,300 |  |  | $ | (39,990 | ) |  | $ | 102,310 |  |  | $ | 142,300 |  |  | $ | (33,414 | ) |  | $ | 108,886 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | As of December 31, 2017 |  | As of December 31, 2016 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount |  | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | (Dollars in thousands) |
Trade name |  | $ | 22,500 |  | $ | (5,512 | ) | $ | 16,988 |  | $ | 22,500 |  | $ | (3,235 | ) | $ | 19,265 |
Technology and know-how |  | 55,300 |  | (17,265 | ) | 38,035 |  | 55,300 |  | (10,397 | ) | 44,903 |
Customer related intangible |  | 64,500 |  | (10,637 | ) | 53,863 |  | 64,500 |  | (6,177 | ) | 58,323 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total finite-lived intangible assets |  | $ | 142,300 |  | $ | (33,414 | ) | $ | 108,886 |  | $ | 142,300 |  | $ | (19,809 | ) | $ | 122,491 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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