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Other Income (Expense)
 6 Months Ended
Jun. 30, 2017
Other Income and Expenses [Abstract]  
Other Income (Expense)
Other Income (Expense)

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)
2017
 
2016
 
2017
 
2016
Gain (loss) on currency transactions
$
(691
)
 
$
6

 
$
(2,235
)
 
$
(724
)
Gain (loss) on mark-to-market natural gas contracts
(236
)
 
769

 
(819
)
 
1,139

Other non-operating income (expense)
283

 
27

 
150

 
372

Other income (expense)
$
(644
)
 
$
802

 
$
(2,904
)
 
$
787