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Other Income and Expense (Tables)
 12 Months Ended
Dec. 31, 2016
Other Income and Expenses [Abstract]  
Components of Other Income (Expense)
Items included in other income in the Consolidated Statements of Operations are as follows:
Year ended December 31,
(dollars in thousands)
 
2016
 
2015
 
2014
Gain (loss) on currency transactions
 
$
775

 
$
2,641

 
$
1,905

Hedge ineffectiveness
 
1,860

 
218

 
(1,247
)
Other non-operating income
 
727

 
21

 
1,693

Other income
 
$
3,362

 
$
2,880

 
$
2,351