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Leases (Tables)
12 Months Ended
Dec. 31, 2018
Leases [Abstract]  
Summary Operating Lease Future Minimum Payments
The minimum lease payments for the noncancelable operating lease agreements are as follows (in thousands):
 
2019
 
$
19,678

2020
 
16,658

2021
 
14,823

2022
 
11,733

2023
 
11,017

Thereafter
 
24,374