Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Receivables
Receivables consisted of the following at December 31:

(dollars in thousands)
2015
 
2014
Trade receivables, net
$
66,648

 
$
54,647

Other receivables
13,455

 
23,973

Total
$
80,103

 
$
78,620