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Income taxes (Tables) | 9 Months Ended
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Sep. 30, 2016
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | The Company's tax provision for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items arising in that quarter. In each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual tax rate changes, a cumulative adjustment is made in that quarter.
| Three months ended |  | Nine months ended
(dollars in thousands) | September 30, 2016 |  | September 30, 2015 |  | September 30, 2016 |  | September 30, 2015
Income tax expense (benefit) | $ | (12,329 | ) |  | $ | 8,474 |  |  | $ | (43,562 | ) |  | $ | 22,975 |
Effective tax rate | 10.6 | % |  | 31.1 | % |  | 12.6 | % |  | 24.6 | %

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- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + 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)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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