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Receivables (Tables)
 6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Schedule of composition of receivables
Receivables consisted of the following:
(dollars in thousands)
June 30,
2017
 
December 31,
2016
Trade receivables, net
$
115,972

 
$
110,873

Other receivables
15,350

 
4,573

Total
$
131,322

 
$
115,446