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Commitments (Tables)
12 Months Ended
Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]  
Future Minimum Lease Payments Under the Terms of the Leases

Future minimum lease payments under the terms of the leases are as follows:

 

Year ending December 31,

 

 

 

 

2019

 

$

6,108

 

2020

 

 

5,133

 

2021

 

 

3,385

 

2022

 

 

1,074

 

2023

 

 

495

 

Thereafter

 

 

1,335

 

 

 

$

17,530