Impairments

The following table summarizes impairment charges recorded during the periods presented:



	Year Ended December 31,
	2015		2014		2013
Oil and gas properties	$	1,396,340	$	791,809	$	132,224
Other – tubular inventory and well materials	1,084		—		—
	$	1,397,424	$	791,809	$	132,224

The following table summarizes the aggregate fair values of the assets described below, by asset category and the classification of inputs within the fair value measurement hierarchy, at the respective dates of impairment:



	Fair Value
	Measurement		Level 1		Level 2		Level 3
Year ended December 31, 2015:
Long-lived assets held for use	$	311,886	$	—	$	—	$	311,886
Year ended December 31, 2014:
Long-lived assets held for use	$	65,203	$	—	$	—	$	65,203
Long-lived assets sold during the year	70,733		$	—	$	—	$	70,733
Year ended December 31, 2013:
Long-lived assets held for use	$	93,945	$	—	$	—	$	93,945

The significant deterioration of commodity prices in 2015, as reflected in the future strip pricing as of December 31, 2015, triggered an impairment of approximately $1.4 billion to our proved and unproved Eagle Ford properties, which required us to reduce their carrying value to a fair value of approximately $312 million. In 2015, we also recorded an impairment charge of $1.1 million attributable to surplus tubular inventory and well materials. In 2014, we recognized oil and gas asset impairments of: (i) $667.8 million in the East Texas, Granite Wash and Marcellus regions due to the decline in commodity prices in the fourth quarter of 2014, (ii) $6.1 million in connection with an uneconomic field drilled in the Mid-Continent region and (iii) $117.9 million to write-down our Selma Chalk assets in Mississippi triggered by the disposition of those properties. In 2013, we recognized oil and gas impairments of: (i) $121.8 million in the Granite Wash, (ii) $9.5 million in the Marcellus Shale and (iii) $0.9 million in the Selma Chalk, in each case due primarily to declines in natural gas prices.