
8.	Additional Balance Sheet Detail

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



	September 30, 2012		December 31, 2011
Other current assets:
Tubular inventory and well materials	$	4,973	$	14,251
Prepaid expenses	610		699
	$	5,583	$	14,950
Other assets:
Debt issuance costs	$	13,759	$	16,993
Assets of supplemental employee retirement plan ("SERP")	3,200		3,088
Other	1,888		51
	$	18,847	$	20,132
Accounts payable and accrued liabilities:
Trade accounts payable	$	30,081	$	30,186
Drilling costs	31,826		30,948
Royalties	13,244		15,235
Production and franchise taxes	6,858		3,495
Compensation - related	5,531		5,186
Interest	19,155		5,964
Other	5,326		3,490
	$	112,021	$	94,504
Other liabilities:
Firm transportation obligation	$	14,443	$	—
Asset retirement obligations	4,543		6,283
Defined benefit pension obligations	1,660		1,763
Postretirement health care benefit obligations	3,035		3,022
Deferred compensation - SERP obligation and other	3,300		3,172
Other	2,277		1,647
	$	29,258	$	15,887