9. 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 $6.9 million in 2014, $4.5 million in 2015, $3.0 million in 2016, $2.3 million in 2017, $1.3 million in 2018 and $1.6 million thereafter. Total rental expense on all operating leases was $7.6 million, $7.9 million, and $9.1 million for the years ended December 31, 2013, 2012, and 2011, 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
(Dollars in thousands)	2013		2012		2011
Raw and other materials	$	40,170	$	30,802	$	33,953
Transportation	9,794		9,731		8,782
Information systems and services	2,746		4,505		3,846
Total payments	$	52,710	$	45,038	$	46,581

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

	Due in
(Dollars in thousands)	2014		2015		2016		2017		2018		Thereafter
Raw and other materials	$	37,800	$	31,679	$	19,162	$	19,580	$	20,017	$	2,164
Transportation	1,575		1,575		436		—		—		—
Information systems and services	2,397		2,397		—		—		—		—
Total contractual cash obligations	$	41,772	$	35,651	$	19,598	$	19,580	$	20,017	$	2,164