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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income
Accumulated other comprehensive income consisted of the following:
Dollars in thousands
Foreign Currency Items
December 31, 2016
$
(6,844
)
Current period other comprehensive income
3,332

December 31, 2017
$
(3,512
)