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Basis of Condensed Consolidated Financial Statements (Tables)
 6 Months Ended
Jun. 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 June 30, 2015 and December 31, 2014:

 
2015
 
2014
Cumulative foreign currency translation
$
(98,606
)
 
$
(77,460
)
Cumulative supplemental benefit plans
(4,462
)
 
(4,266
)
Net unrecognized losses on interest rate swap
(3,402
)
 
(2,335
)
Net unrealized gains on marketable securities
1,224

 
275

Accumulated other comprehensive loss
$
(105,246
)
 
$
(83,786
)