

11.	Leases

We lease various office facilities, equipment and vehicles under operating lease arrangements, some of which contain rent escalation clauses. Most of the leases contain purchase and/or renewal options at fair market and fair rental value, respectively. Rental expense relating to all operating leases was $15.4 million, $15.4 million and $15.0 million in 2018, 2017 and 2016, respectively. At December 31, 2018, future minimum rental payments under noncancelable operating leases are as follows:



(in thousands)	Operating Leases

2019	$	16,542
2020	16,325
2021	13,932
2022	12,791
2023	10,623
Thereafter	23,638
Total minimum lease payments	$	93,851