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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Minimum annual rental commitments
Minimum annual rental commitments under noncancellable operating leases consisted of the following at December 31, 2018 (in thousands):
 
2019
 
$
1,562
 
2020
 
 
1,369
 
2021
 
 
1,235
 
2022
 
 
1,067
 
2023
 
 
707
 
Thereafter
 
 
2,023
 
 
 
$
7,963