LEASES

We lease office facilities for use in our operations, as well as transportation and other equipment. Most of our leases are non-cancelable operating lease agreements and they expire at various dates through 2026. In addition to rent, the leases generally require us to pay taxes, maintenance, insurance and certain other operating expenses.

Rent expense was approximately $8.0 million in 2018, $6.9 million in 2017, and $6.7 million in 2016, which included rent expense associated with related party lease agreements of $150,000 in 2017, and $330,000 in 2016. We had no related party lease agreements in 2018.

Future minimum lease payments under all non-cancelable leases at December 31, 2018 are as follows:



Years Ending December 31,
2019	$	5,994
2020	5,146
2021	3,976
2022	1,925
2023	1,164
Thereafter	2,132
Total	$	20,337