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Leases (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
Minimum payments for operating leases having initial or remaining non-cancelable lease terms in excess of one year at December 31, 2017 are summarized below (dollars in thousands):
Year ended December 31,
 
Minimum Payments
2018
 
$
13,960

2019
 
12,870

2020
 
12,010

2021
 
10,830

2022
 
7,430

Thereafter
 
19,850

Total
 
$
76,950