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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill [Abstract]  
Schedule of Goodwill [Table Text Block]
Goodwill activity related to these acquisitions is included in the table below:
 
(Dollars in thousands)
 
December 31,
 
2017
 
2016
Beginning balance
$
5,520

 
$
319

Acquisition
14,176

 
5,231

Impact of foreign exchange
(9
)
 
(30
)
Adjustment to prior year allocation (1)
(73
)
 
—

Ending balance
$
19,614

 
$
5,520


(1)
The reduction of $0.1 million in 2017 resulted from a non-cash adjustment to the estimated purchase price allocation to inventory originally recorded in 2016.

Goodwill was tested for impairment in the fourth quarter of 2017 and no adjustment was deemed necessary.