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Commitments, Contingencies and Concentrations of Risk (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of minimum annual lease payments, excluding any renewals and extensions, property taxes, and other operating expenses, due under the agreements
The following schedule shows the minimum annual lease payments, excluding any renewals and extensions, property taxes, and other operating expenses, due under these agreements:
 
Year ending December 31,
 
Amount
 
 
(dollars in thousands)
2018
 
$
7,170

2019
 
5,476

2020
 
2,675

2021
 
1,887

2022
 
1,421

Thereafter
 
2,312

Total
 
$
20,941