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Other Income and Expense (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Components of Other Income (Expense)
Items included in other income (expense) in the Consolidated Statements of Operations are as follows:
Year ended December 31,
(dollars in thousands)
 
2017
 
2016
 
2015
Gain (loss) on currency transactions
 
$
(2,788
)
 
$
775

 
$
2,641

Gain (loss) on mark-to-market natural gas contracts
 
(1,036
)
 
1,860

 
(714
)
Hedge ineffectiveness
 
—

 
—

 
932

Other non-operating income
 
309

 
727

 
21

Other income (expense)
 
$
(3,515
)
 
$
3,362

 
$
2,880