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Income taxes- Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 5 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 | Jun. 30, 2018 | Jun. 30, 2017 | Aug. 14, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Income taxes |  |  |  |  |  |
U.S. income taxes, Current | $ (52) |  |  |  | $ (1,066) | $ (878)
U.S. income taxes, Deferred | 686 |  |  |  | 38 | 1,152
U.S. income taxes, Total | 634 |  |  |  | (1,028) | 274
Non-U.S. income taxes, Current | 1,566 |  |  |  | 5,924 | 5,389
Non-U.S. income taxes, Deferred | 4,682 |  |  |  | (15,677) | (13,215)
Non-U.S. income taxes, Total | 6,248 |  |  |  | (9,753) | (7,826)
Income Tax Expense (Benefit), Total | $ 6,882 | $ 11,379 | $ 1,286 |  | $ (10,781) | $ (7,552)
Predecessor [Member] |  |  |  |  |  |
Income taxes |  |  |  |  |  |
U.S. income taxes, Current |  |  |  | $ (20) |  |
U.S. income taxes, Deferred |  |  |  | 403 |  |
U.S. income taxes, Total |  |  |  | 383 |  |
Non-U.S. income taxes, Current |  |  |  | 5,547 |  |
Non-U.S. income taxes, Deferred |  |  |  | 522 |  |
Non-U.S. income taxes, Total |  |  |  | 6,069 |  |
Income Tax Expense (Benefit), Total |  |  |  | $ 6,452 |  |

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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