5. INVENTORY

Our inventory is comprised of the following:

	June 30,		December 31,
	2015		2014
	(in millions)
Materials and supplies	$	2.2	$	2.2
Crude oil inventory		5.7		13.2
Natural gas and NGL inventory		82.3		78.8
	$	90.2	$	94.2

“Commodity costs” on our consolidated statements of income include charges totaling $0.7 million and $1.5 million for the three months ended June 30, 2015 and 2014 respectively, and $5.3 million and $3.3 million for the six months ended June 30, 2015 and 2014, respectively, that we recorded to reduce the cost basis of our inventory of natural gas and NGLs, to reflect the current market value.