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Accumulated other comprehensive income (loss) (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Schedule of accumulated other comprehensive income (loss) | The changes in accumulated other comprehensive income (loss) by component, for the six months ended June 30, 2018 are as follows:
| Foreign currency translation adjustments |  | Pensions, net of tax |  | Total
Balance as of December 31, 2017 | $ | (547,927 | ) |  | (10,600 | ) |  | (558,527 | )
Current period other comprehensive income | (112,829 | ) |  | 223 |  |  | (112,606 | )
Balance as of June 30, 2018 | $ | (660,756 | ) |  | (10,377 | ) |  | (671,133 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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