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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Rental Payments on Operating Leases
Future minimum rental payments on such operating leases at December 31, 2017 are as follows:
(Dollar amounts in thousands)
Unrelated
parties
 
Related
party
 
Minimum future
rentals to related
parties
2018
$
478

 
$
7,004

 
$
7,482

2019
139

 
7,228

 
7,367

2020
21

 
2,397

 
2,418

2021

 
605

 
605

2022 and thereafter

 

 

 
$
638

 
$
17,234

 
$
17,872