Additional Balance Sheet Detail

The following table summarizes components of selected balance sheet accounts as of the dates presented:



	As of
	June 30,		December 31,
	2015		2014
Other current assets:
Tubular inventory and well materials ¹	$	4,452	$	5,802
Prepaid expenses	3,825		4,215
Other	104		97
	$	8,381	$	10,114
Other assets:
Assets of supplemental employee retirement plan (“SERP”)	$	4,206	$	4,123
Deferred issuance costs of the Revolver	2,021		1,623
Other	95		95
	$	6,322	$	5,841
Accounts payable and accrued liabilities:
Trade accounts payable	$	84,584	$	174,496
Drilling and other lease operating costs	47,872		68,842
Royalties	26,263		27,883
Compensation – related	12,846		9,197
Interest	15,646		15,555
Preferred stock dividends	6,067		6,067
Other	4,611		10,187
	$	197,889	$	312,227
Other liabilities:
Deferred gains on sales of assets	$	91,226	$	90,569
Firm transportation obligation	11,390		12,042
Asset retirement obligations (“AROs”)	6,191		5,889
Defined benefit pension obligations	1,537		1,753
Postretirement health care benefit obligations	942		890
Compensation – related	1,124		7,631
Deferred compensation – SERP obligations and other	4,243		4,183
Other	929		929
	$	117,582	$	123,886

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¹ We recorded an impairment charge of $1.1 million attributable to surplus tubular inventory and well materials during the three months ended June 30, 2015. We anticipate selling certain of these materials on the surplus market during the second half of 2015.