Receivables (Tables)
 9 Months Ended
Sep. 30, 2015
Receivables [Abstract]  
Schedule of composition of receivables
Receivables consisted of the following:
(dollars in thousands)
September 30,
2015
 
December 31,
2014
Trade receivables, net
$
68,794

 
$
54,647

Other receivables
7,648

 
23,973

Total
$
76,442

 
$
78,620