8. Leases

The Company leases office space and equipment at its various locations. Many of the leases contain renewal options with varying terms and conditions. Management expects that in the normal course of business, expiring leases will be renewed or, upon making a decision to relocate, replaced by leases for new locations. Operating lease terms range from three to ten years. Rent expense includes insurance, maintenance, and other costs as required by the lease. Total rental expense was $25.1 million, $20.8 million and $20.7 million for the years ended December 31, 2017, 2016 and 2015, respectively.

The Company began participating in a fleet program during 2014. The program allows employees that drive over 12,000 miles on an annual basis to qualify for a vehicle; all participation is voluntary. The individual operating leases are for a minimum of 12 months. Fleet expense was $1.2 million, $5.3 million and $7.2 million for the years ended December 31, 2017, 2016 and 2015, respectively. The fleet program was terminated during the year ended December 31, 2017.

Future minimum rental commitments under non-cancelable operating leases are as follows (amounts in thousands):



Year	Total
2018	$	23,119
2019	16,408
2020	12,120
2021	8,881
2022	5,514
Thereafter	7,172
	$	73,214