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Operating Leases (Tables)
12 Months Ended
Dec. 31, 2017
Operating Leases [Abstract]  
Schedule of Minimum Non-Cancellable Rental Payments and Rental Receipts
Minimum non-cancellable rental payments and rental receipts are as follows:

(in thousands)
 
Payments
  
Receipts
 
2018
 $
2,050
  $
574
 
2019
  
1,673
   
411
 
2020
  
1,626
   
351
 
2021
  
1,515
   
235
 
2022
  
1,392
   
100
 
Thereafter
  
3,783
   
145
 
Total
 
$
12,039
  
$
1,816