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Accumulated other comprehensive income (loss) (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Accumulated Other Comprehensive Income Rollforward [Roll Forward] |
Balance as of December 31, 2017 | $ 7,067,009
Balance as of June 30, 2018 | 7,373,434
Foreign currency translation adjustments |
Accumulated Other Comprehensive Income Rollforward [Roll Forward] |
Balance as of December 31, 2017 | (547,927)
Current period other comprehensive income | (112,829)
Balance as of June 30, 2018 | (660,756)
Pensions, net of tax |
Accumulated Other Comprehensive Income Rollforward [Roll Forward] |
Balance as of December 31, 2017 | (10,600)
Current period other comprehensive income | 223
Balance as of June 30, 2018 | (10,377)
AOCI attributable to parent |
Accumulated Other Comprehensive Income Rollforward [Roll Forward] |
Balance as of December 31, 2017 | (558,527)
Current period other comprehensive income | (112,606)
Balance as of June 30, 2018 | $ (671,133)

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