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Accumulated other comprehensive income (loss)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Accumulated other comprehensive income (loss)
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
)