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v3.3.1.900

Reconciliation of income and expenses (Details 5) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax | $ 6,261 | $ (202,626) | $ (251,415) | $ (324,605) | $ 27,700 | $ 38,482 | $ 23,881 | $ 25,112 | $ (772,385) | $ 115,175 | $ 109,879
Discontinued operations, held-for-sale or disposed by sale [Member] |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 184,853 | 547,571 | 536,023
Operating expenses |  |  |  |  |  |  |  |  | 1,423,037 | 378,891 | 364,120
Operating income (loss) |  |  |  |  |  |  |  |  | (1,238,184) | 168,680 | 171,903
Other income |  |  |  |  |  |  |  |  | 2,374 | 1,163 | 549
Interest expense |  |  |  |  |  |  |  |  | 235 | 110 | 114
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  | (1,236,045) | 169,733 | 172,338
Income taxes |  |  |  |  |  |  |  |  | (463,660) | 54,558 | 62,459
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | $ (772,385) | $ 115,175 | $ 109,879

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