Leases

We lease office space and certain computer and related equipment using noncancelable operating leases. At December 31, 2018, future lease payments for operating leases with initial or remaining noncancelable terms of one year or more consisted of the following:



2019	$	192
2020	165
2021	139
2022	127
2023	109
Thereafter	385
Total minimum payments required	$	1,117

We have certain lease agreements that contain contingent payment provisions. Under these provisions, we pay contingent amounts in addition to base rent, primarily based upon annual changes in the consumer price index. The schedule above contains estimated amounts for potential future increases in lease payments based on the contingent payment provisions.

Lease expense for 2018, 2017 and 2016 was $207, $205 and $207, respectively.