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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Obligations Under Non-Cancelable Operating Leases
 
Obligations under 
non-cancelable
 operating leases, including the facility leases discussed above, as of December 31, 2018 are as follows (amounts in thousands):
 
For the Years Ended December 31,
 
Operating
 
Leases
 
2019
 
$
4,021
 
2020
 
 
3,599
 
2021
 
 
3,263
 
2022
 
 
2,213
 
2023
 
 
1,316
 
2024 and thereafter
 
 
3,622
 
Minimum operating lease payments
 
$
18,034