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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Lease Payments under Non-Cancelable Operating Leases

Future minimum lease payments under non-cancelable operating leases as of December 31, 2018 are as follows (in thousands): 

 

2019

   $ 30,824  

2020

     22,038  

2021

     17,946  

2022

     12,708  

2023

     9,440  

Thereafter

     10,522  
  

 

 

 
   $ 103,478