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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Rental Commitments Under Operating Leases
Future minimum rental commitments under non-cancelable leases as of December 31, 2018 are as follows (in thousands):
 
Year
 
Operating

Leases
 
2019
 
$
6,682
 
2020
 
 
5,372
 
2021
 
 
5,350
 
2022
 
 
6,910
 
2023
 
 
5,283
 
Total minimum lease payments
 
$
29,597