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Operating Leases (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Future Minimum Rental Payments Under Operating Leases
Future minimum rentals under operating leases are as follows (dollars in thousands):
2018
 
2019
 
2020
 
2021
 
2022
 
2023 and
thereafter
 
$15,542
 
$13,593
 
$11,496
 
$8,028
 
$7,178
 
$24,675