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Leases
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Leases
Leases

Rental expense for operating leases was $19.3 million, $18.2 million, and $18.1 million for the years ended December 31, 2017, 2016, and 2015, respectively. Sublease rental income was not material in any of the periods presented.

As of December 31, 2017, our minimum lease payment requirements for noncancelable operating leases with terms of more than one year are as follows (in thousands):

2018
 
$
15,137

2019
 
14,538

2020
 
14,185

2021
 
12,635

2022
 
11,129

Thereafter
 
58,658

Total
 
$
126,282



These future minimum lease payment requirements have not been reduced by sublease income due in the future under noncancelable subleases. Minimum sublease income expected to be received in the future is not material.