15. Commitments

The Company has entered into leases covering principally office, research and warehouse space, office equipment and vehicles. Future minimum rental payments required under all operating leases that have remaining noncancelable lease terms in excess of one year are $7.1 million in 2016, $6.5 million in 2017, $4.6 million in 2018, $3.3 million in 2019, $2.2 million in 2020, and $20.6 million thereafter. Total rental expense on all operating leases was $8.9 million, $7.9 million, and $7.6 million for the years ended December 31, 2015, 2014, and 2013, respectively.

The Company has in place long-term supply contracts for the purchase of raw materials, transportation, and information systems and services. The following table represents the total payments made for the purchases under the aforementioned supply contracts:

	December 31
	2015		2014		2013
Raw and other materials	$	27,832	$	38,096	$	40,170
Transportation	5,160		11,461		9,794
Information systems and services	1,871		2,163		2,746

Total payments	$	34,863	$	51,720	$	52,710

Future minimum purchase requirements under the terms of the aforementioned contracts are as follows:

	Due in
	2016		2017		2018		2019		2020		Thereafter
Raw and other materials	$	20,022	$	20,330	$	20,553	$	721	$	721	$	1,443

Total contractual cash obligations	$	20,022	$	20,330	$	20,553	$	721	$	721	$	1,443