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Accumulated other comprehensive income (loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Schedule of accumulated other comprehensive income (loss)
The changes in accumulated other comprehensive income (loss) by component, for the three months ended March 31, 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
71,494

 
(135
)
 
71,359

Balance as of March 31, 2018
$
(476,433
)
 
(10,735
)
 
(487,168
)