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Basis of Presentation (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Receivables
Receivables consisted of the following at December 31:
(dollars in thousands)
2017
 
2016
Trade receivables, net
$
139,165

 
$
110,873

Other receivables
11,095

 
4,573

Total
$
150,260

 
$
115,446