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Leases (Tables)
12 Months Ended
Dec. 31, 2018
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
The future minimum lease payments under operating leases that have initial or remaining noncancelable lease terms in excess of one year as of December 31, 2018, are summarized as follows:
Year Ended (in thousands)
 
2019
$
1,181

2020
1,009

2021
838

2022
617

2023
196

Thereafter
166

Total
$
4,007