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Goodwill and other intangible assets | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Goodwill And Other Intangible Assets | (5) Goodwill and other intangible assets We are required to review goodwill and indefinite-lived intangible assets annually for impairment. Goodwill impairment is tested at the graphite electrodes reporting unit level on an annual basis and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. 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 |
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization expense of acquired intangible assets was $6.6 million and $6.9 million in the six months ended June 30, 2018 and 2017, respectively. Estimated amortization expense will approximate $6.3 million in the remainder of 2018, $12.2 million in 2019, $11.4 million in 2020, $10.7 million in 2021 and $10.1 million in 2022. | (6) Goodwill and other intangible assets We are required to review goodwill and indefinite-lived intangible assets annually for impairment. Goodwill impairment is tested at the reporting unit level on an annual basis and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. For the years ended December 31, 2017 and 2016, an assessment for potential impairment was performed and an impairment adjustment was not required. We received notice, in March 2015, that the market prices for needle coke were decreasing 18%, effective for the second quarter of 2015. This decline compressed our margins for needle coke products versus our annual plan assumptions. We determined that this change, which was driven by overcapacity in the market, indicated that the needle coke industry was facing a deeper and longer trough than previously expected. As such, we considered the additional price change as a triggering event for our Needle coke reporting unit and tested its goodwill for impairment as of March 31, 2015. In the first step of the analysis, we compared the estimated fair value of the reporting unit to its carrying value, including goodwill. The fair value of the reporting unit was determined based on an income approach, using a discounted cash-flow ("DCF") model from a market participant's perspective. The estimated future cash-flows were updated versus the year-end analysis to reflect the expectation of a longer trough. A discount rate of 10.5% was applied to the forecasted cash-flows and is based on a weighted average cost of capital ("WACC"). Company specific beta and mix of debt to equity are inputs into the determination of the WACC, which is then qualitatively assessed from the standpoint of potential market participants. Based on the step one analysis described earlier, the fair value of the needle coke reporting unit was below its carrying value, resulting in a step two analysis and consequently the full impairment of the needle coke goodwill, resulting in a charge of $35.4 million. As a result of our acquisition by Brookfield, our goodwill and intangibles were revalued as of August 15, 2015. See Note 2 "Preferred share issuance and merger" for description of the Merger and the results of purchase price accounting. The following table represents the changes in the carrying value of goodwill and intangibles from December 31, 2015 through December 31, 2017:
​ | ​ | ​ | ​
|  | 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 |
​ | ​ | ​ | ​
The following table summarizes acquired intangible assets with determinable useful lives by major category which are included in "Other Assets" on our consolidated balance sheets:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | 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 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization expense of intangible assets was $13.6 million and $14.3 million in 2017 and 2016, respectively. Amortization expense of intangible assets was $5.5 million in the period August 15 through December 31, 2015 and $10.5 million in the period January 1 through August 14, 2015. Estimated annual amortization expense for the next five years will approximate $12.9 million in 2018, $12.2 million in 2019, $11.4 million in 2020, $10.7 million in 2021 and $10.1 million in 2022.

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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