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Leases (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Future Minimum Lease Payments
Future minimum lease payments for noncancelable operating leases for each of the five succeeding years and thereafter are as follows:
(In Thousands)
 
2018
$
1,648

2019
1,565

2020
1,556

2021
1,397

2022
1,410

Thereafter
4,820

 
$
12,396