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Other Income (Expense) (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
Six months ended June 30,
(dollars in thousands)
 
2019
 
2018
 
2019
 
2018
Gain (loss) on currency transactions
 
$
(186
)
 
$
2,662

 
$
(1,349
)
 
$
1,012

Pension and non-pension benefits, excluding service cost
 
(365
)
 
(243
)
 
(771
)
 
(583
)
Other non-operating income (expense)
 
(69
)
 
161

 
(84
)
 
44

Other income (expense)
 
$
(620
)
 
$
2,580

 
$
(2,204
)
 
$
473