Commitments (Tables)

12 Months Ended

Dec. 31, 2015

Commitments

Schedule of total payments made for purchases under long-term 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

Schedule of future minimum purchase requirements under terms of long-term supply contracts

	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