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Other Income (Expense) (Tables)
 3 Months Ended
Mar. 31, 2019
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Items included in other income (expense) in the Condensed Consolidated Statements of Operations are as follows:
 
 
Three months ended March 31,
(dollars in thousands)
 
2019
 
2018
Gain (loss) on currency transactions
 
$
(1,163
)
 
$
(1,650
)
Pension and non-pension benefits, excluding service cost
 
(406
)
 
(340
)
Other non-operating income (expense)
 
(15
)
 
(117
)
Other income (expense)
 
$
(1,584
)
 
$
(2,107
)