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Other Income (Expense) (Tables)
 9 Months Ended
Sep. 30, 2017
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)
2017
 
2016
 
2017
 
2016
Gain (loss) on currency transactions
$
548

 
$
348

 
$
(1,687
)
 
$
(376
)
Gain (loss) on mark-to-market natural gas contracts
(4
)
 
11

 
(823
)
 
1,150

Other non-operating income (expense)
77

 
(111
)
 
227

 
261

Other income (expense)
$
621

 
$
248

 
$
(2,283
)
 
$
1,035