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Reconciliation of income and expenses (Details 5) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income from discontinued operations | $ 477 | $ 1,687 | [1]
Discontinued operations, held-for-sale or disposed of by sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Operating revenues | 66 | 105 |
Operating expenses | 174 | (6,577) |
Operating income (loss) | (108) | 6,682 |
Other income | 12 |  |
Other expense |  | (15) |
Interest expense | 575 | 0 |
Income (loss) from discontinued operations before income taxes | (671) | 6,667 |
Income taxes | (1,148) | 4,980 | [2]
Income from discontinued operations | $ 477 | $ 1,687 |
[1] | Includes an elimination for the presentation of income tax adjustments between continuing and discontinued operations.
[2] | Includes an elimination for the presentation of income tax adjustments between continuing and discontinued operations.

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