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Basis of Condensed Consolidated Financial Statements (Tables)
 3 Months Ended
Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table shows the components of accumulated other comprehensive loss, net of taxes as of March 31, 2016 and December 31, 2015:

 
2016
 
2015
Cumulative foreign currency translation
$
(102,831
)
 
$
(114,427
)
Cumulative supplemental benefit plans
(3,647
)
 
(3,540
)
Net unrecognized losses on interest rate swap
(5,298
)
 
(2,699
)
Net unrealized gains on marketable securities
943

 
550

Accumulated other comprehensive loss
$
(110,833
)
 
$
(120,116
)