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Reclassification out of accumulated other comprehensive income (loss) (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Interest expense | $ (23,790) | $ (21,484) | $ (46,919) | $ (42,431)
Income (loss) from discontinued operations, net of tax | (251,415) | 23,881 | (576,020) | 48,993
Other income | 2,320 | 2,470 | 2,764 | 4,638
Income taxes | (9,801) | (13,894) | (15,626) | (27,696)
Income from continuing operations | 14,057 | 29,446 | 29,217 | 60,473
Net income (loss) | (237,358) | 53,327 | (546,803) | 109,466
Net Unrealized Gain (Loss) on Derivative Instruments Qualifying as Hedges |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Income taxes | 60 | 60 | 121 | 121
Income from continuing operations | (100) | (100) | (199) | (199)
Net income (loss) | (100) | (13) | (199) | (357)
Postretirement Liability Adjustment |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Net periodic benefit cost | (1,004) | (395) | (1,608) | (838)
Income taxes | 420 | 150 | 649 | 318
Net income (loss) | (584) | (245) | (959) | (520)
Foreign Currency Translation Adjustment |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Other income | 0 | 0 | (1,293) | 0
Income taxes | 0 | 0 | 491 | 0
Net income (loss) | 0 | 0 | (802) | 0
Net Unrealized Gain on Available-for-sale Investments |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Other income | (43) | (49) | (98) | (49)
Income taxes | 15 | 17 | 34 | 17
Net income (loss) | (28) | (32) | (64) | (32)
Total Accumulated Other Comprehensive Loss |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Net income (loss) | (712) | (290) | (2,024) | (909)
Interest rate derivative instruments [Member] | Net Unrealized Gain (Loss) on Derivative Instruments Qualifying as Hedges |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Interest expense | (160) | (160) | (320) | (320)
Commodity derivative instruments [Member] | Net Unrealized Gain (Loss) on Derivative Instruments Qualifying as Hedges |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Income (loss) from discontinued operations, net of tax | $ 0 | $ 87 | $ 0 | $ (158)

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