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Lease Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Minimum Rental Commitments under Noncancelable Leases
Minimum rental commitments under noncancelable leases with terms in excess of one year as of December 31, 2017 were as follows (in thousands):
 
 
Operating
Leases
2018
$
124

2019
102

2020
79

2021
74

2022 and thereafter
54

 
$
433