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Other Income (Expense) (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
(dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Gain (loss) on currency transactions
 
$
2,662

 
$
(691
)
 
$
1,012

 
$
(2,235
)
Gain (loss) on mark-to-market natural gas contracts
 
—

 
(236
)
 
—

 
(819
)
Pension and non-pension benefits, excluding service cost
 
(243
)
 
(208
)
 
(583
)
 
(734
)
Other non-operating income (expense)
 
161

 
283

 
44

 
150

Other income (expense)
 
$
2,580

 
$
(852
)
 
$
473

 
$
(3,638
)