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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss, net of tax, for the years ended December 31, 2017 and 2016, are as follows:
 
 
2017
 
2016
Pension and post-retirement benefit plan adjustments
 
$
(3,367
)
 
$
(4,439
)
Unrealized gain (loss) on interest rate swap contracts
 
222

 
(204
)
Foreign currency translation adjustments
 
(14,622
)
 
(20,646
)
 
 
$
(17,767
)
 
$
(25,289
)