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Accumulated other comprehensive income (loss) (Tables)
 6 Months Ended
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
)