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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Contractual Obligation, Fiscal Year Maturity Schedule
As of December 31, 2017, future minimum lease payments under these non-cancelable leases are:
  
(in thousands)
 
Operating
Leases
2018
 
$
3,899

2019
 
2,787

2020
 
1,502

2021
 
724

2022
 
177

Thereafter
 
55

Total minimum lease payments
 
$
9,144