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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Minimum Future Lease Payments
Future minimum lease payments under noncancelable operating leases as of December 31, 2017 are as follows (in thousands):
2018
$
6,574

2019
6,342

2020
4,775

2021
4,743

2022
4,885

Thereafter
18,484

 
$
45,803