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



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013		2012
Oil and gas properties	$	132,224	$	—	$	132,224	$	28,481
Other - tubular inventory and well materials	—		700		—		835
	$	132,224	$	700	$	132,224	$	29,316

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
Three and nine months ended September 30, 2013:
Long-lived assets held for use	$	93,945	$	—	$	—	$	93,945
Nine months ended September 30, 2012:
Long-lived assets sold during the year	$	96,099	$	—	$	—	$	96,099

In September 2013, we recognized impairments of our assets including the Granite Wash play in the Mid-Continent region for $121.8 million, the Marcellus Shale in Pennsylvania for $9.5 million and the Selma Chalk in Mississippi for $0.9 million, in each case due primarily to market declines in current and expected future commodity prices. In June 2012, we recognized an impairment of our Appalachian assets triggered by the expected disposition of those properties in the third quarter of 2012. We also recognized impairments of certain tubular inventory and well materials in both the three and nine month periods in 2012 triggered primarily by declines in asset quality.