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Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Amounts recognized, net of tax, in Accumulated other comprehensive income (loss) for the years ended December 31, 2017 and 2016 consist of (in thousands):
 
2017
 
2016
Prior service cost
$
541

 
$
600

Unrecognized net actuarial loss and foreign exchange
(8,703
)
 
(9,769
)
Fair value of derivatives
(191
)
 
(659
)
   Total Accumulated other comprehensive (loss)
$
(8,353
)
 
$
(9,828
)