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Other Income (Expense)
 12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
Other Income (Expense)
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)
 
2018
 
2017
Gain (loss) on currency transactions
 
$
(1,454
)
 
$
(2,788
)
(Loss) on mark-to-market natural gas contracts
 
—

 
(1,036
)
Pension and non-pension benefits, excluding service cost
 
(1,232
)
 
(1,791
)
Other non-operating income (expense)
 
(78
)
 
309

Other income (expense)
 
$
(2,764
)
 
$
(5,306
)