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Basis of Condensed Consolidated Financial Statements (Tables)
 9 Months Ended
Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Comprehensive Income (Loss) [Table Text Block]
The following table shows the components of accumulated other comprehensive loss, net of taxes as of September 30, 2015 and December 31, 2014:

 
2015
 
2014
Cumulative foreign currency translation
$
(122,539
)
 
$
(77,460
)
Cumulative supplemental benefit plans
(4,559
)
 
(4,266
)
Net unrecognized losses on interest rate swap
(5,445
)
 
(2,335
)
Net unrealized gains on marketable securities
490

 
275

Accumulated other comprehensive loss
$
(132,053
)
 
$
(83,786
)