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 $13.6 million, $13.4 million and $13.9 million in 2015, 2014 and 2013, respectively. At December 31, 2015, future minimum rental payments under noncancelable operating leases are as follows:



	Operating Leases
	(in thousands)
2016	$	13,961
2017	11,196
2018	9,423
2019	6,366
2020	4,200
Thereafter	3,312
Total minimum lease payments	$	48,458