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Equity (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015 consist of (in thousands):
 
2016
 
2015
Prior service cost
$
600

 
$
661

Unrecognized net actuarial loss and foreign exchange
(9,769
)
 
(10,201
)
Fair value of derivatives
(659
)
 
(998
)
   Total Accumulated other comprehensive (loss)
$
(9,828
)
 
$
(10,538
)