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Leases (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Future Minimum Lease Payments under Operating Lease Obligations
Future minimum lease payments under operating lease obligations as of December 31, 2017 were as follows:

(in thousands) 
   
2017
 
$
1,626
 
2018
  
1,391
 
2019
  
1,339
 
2020
  
1,343
 
2021
  
1,346
 
2022 and beyond
  
3,685
 
Total minimum lease payments
 
$
10,730