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Leases (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
Future minimum payments as of December 31, 2017 under non-cancelable operating leases with initial terms exceeding one year are as follows (in thousands):
Year
 
2018
$
17,417

2019
15,730

2020
14,592

2021
12,988

2022
10,763

Thereafter
45,905

 
$
117,395