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Other Income (Expense), Net (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Other income (expense), net consisted of the following:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Foreign currency transaction gain (loss), net
$
7,238

 
$
(3,835
)
 
$
(5,114
)
Foreign currency contract gain (loss), net
(5,358
)
 
4,154

 
4,904

Other
144

 
(440
)
 
122

Total
$
2,024

 
$
(121
)
 
$
(88
)