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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
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, 2017 are as follows (in thousands): 

 

2018

   $ 34,337  

2019

     24,178  

2020

     16,633  

2021

     12,065  

2022

     8,125  

Thereafter

     9,934  
  

 

 

 
   $ 105,272