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Operating Lease Agreements (Tables)
12 Months Ended
Dec. 31, 2017
Operating Lease Agreements [Abstract]  
Future Minimum Rental Commitments
(Dollars in thousands)
     
2018
 
$
15,740
 
2019
   
16,026
 
2020
   
15,569
 
2021
   
6,718
 
2022
   
6,335
 
Thereafter
   
14,628
 
Net commitments
 
$
75,016
 
         
(Some amounts may not reconcile due to rounding.)