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Accumulated other comprehensive income (loss) (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Schedule of accumulated other comprehensive income (loss)
The changes in accumulated other comprehensive income (loss) by component, for the nine months ended September 30, 2017 are as follows:
 
Foreign currency translation adjustments
 
Pensions, net of tax
 
Total
Balance as of December 31, 2016
$
(825,354
)
 
(7,673
)
 
(833,027
)
Current period other comprehensive income (loss) before reclassifications
262,350

 
(692
)
 
261,658

Balance as of September 30, 2017
$
(563,004
)
 
(8,365
)
 
(571,369
)