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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Comprehensive Income (Loss) [Table Text Block]
The following table shows the components of accumulated other comprehensive loss, net of taxes as of December 31, 2014 and 2013:

 
2014
 
2013
Cumulative foreign currency translation
$
(77,460
)
 
$
(50,787
)
Cumulative supplemental benefit plans
(4,266
)
 
(568
)
Net unrecognized losses on interest rate swap
(2,335
)
 
(2,482
)
Net unrealized gains on marketable securities
275

 
248

Accumulative other comprehensive loss
$
(83,786
)
 
$
(53,589
)