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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies  
Schedule of minimum rental commitments under non-cancelable operating leases
2018$1,096
20191,115
20201,095
2021201
202213
Thereafter384
Summary of rent expenses relating to operating lease
201720162015
Rent expense$2,347$2,183$2,361