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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of Comprehensive Loss
The following table shows the components of accumulated other comprehensive loss, net of taxes as of December 31, 2017 and 2016:

 
2017
 
2016
Cumulative foreign currency translation
$
(95,630
)
 
$
(118,071
)
Cumulative supplemental benefit plans
(5,461
)
 
(6,267
)
Net unrecognized losses on interest rate swaps
7,400

 
1,920

Accumulative other comprehensive loss
$
(93,691
)
 
$
(122,418
)