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Other Income (Expense) (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30,
 
Nine months ended
September 30,
(dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Gain (loss) on currency transactions
 
$
(1,294
)
 
$
548

 
$
(282
)
 
$
(1,687
)
(Loss) on mark-to-market natural gas contracts
 
—

 
(4
)
 
—

 
(823
)
Pension and non-pension benefits, excluding service cost
 
(295
)
 
(428
)
 
(878
)
 
(1,162
)
Other non-operating income (expense)
 
136

 
77

 
180

 
227

Other income (expense)
 
$
(1,453
)
 
$
193

 
$
(980
)
 
$
(3,445
)