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Leases (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Summary of Future Minimum Rental Payments Under Operating Leases

Future minimum rental payments required under operating leases having initial or remaining non-cancelable lease terms in excess of one year at December 31, 2017 are as follows (in thousands):

 

Year ending December 31,

 

 

 

 

2018

 

$

13,616

 

2019

 

 

9,368

 

2020

 

 

7,112

 

2021

 

 

5,165

 

2022

 

 

3,844

 

Thereafter

 

 

8,917

 

Total

 

$

48,022