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Basis of Condensed Consolidated Financial Statements (Tables)
 9 Months Ended
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
The following table shows the components of accumulated other comprehensive loss, net of taxes as of September 30, 2017 and December 31, 2016:

 
2017
 
2016
Cumulative foreign currency translation
$
(95,310
)
 
$
(118,071
)
Cumulative supplemental benefit plans
(4,748
)
 
(6,267
)
Net unrecognized gains on interest rate swaps
3,541

 
1,920

Accumulated other comprehensive loss
$
(96,517
)
 
$
(122,418
)