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New accounting standards (Details 11) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability | $ (39,500) | $ 7,735 | $ 0 | $ 0
Other comprehensive income (loss) [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability | 7,700 |  |  |
Adjustments for New Accounting Pronouncement [Member] | Other comprehensive income (loss) [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability | $ 7,700 |  |  |

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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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