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Other Income (Expense) (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
(dollars in thousands)
2018
 
2017
Gain (loss) on currency transactions
$
(1,650
)
 
$
(1,544
)
Gain (loss) on mark-to-market natural gas contracts
—

 
(582
)
Pension and non-pension benefits, excluding service cost
(340
)
 
(526
)
Other non-operating income (expense)
(117
)
 
(134
)
Other income (expense)
$
(2,107
)
 
$
(2,786
)