Leases

The Company operates certain administrative, manufacturing, warehouse and testing facilities and equipment under lease arrangements that are accounted for as operating leases. Total rental expense was $15.1 million, $14.4 million and $15.0 million for 2017, 2016 and 2015, respectively.

Future minimum operating lease payments at December 31, 2017 were as follows (in thousands):



2018	$	15,074
2019	14,225
2020	9,601
2021	8,523
2022	6,192
Thereafter	8,379
Total operating lease payments	$	61,994