Additional Balance Sheet Detail (Tables)

6 Months Ended

Jun. 30, 2012

Components of Selected Balance Sheet Accounts

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

	June 30, 2012		December 31, 2011
Other current assets:
Tubular inventory and well materials	$	5,588	$	14,251
Prepaid expenses	1,262		699
	$	6,850	$	14,950
Other assets:
Debt issuance costs	$	15,617	$	16,993
Assets of supplemental employee retirement plan ("SERP")	3,298		3,088
Other	1,890		51
	$	20,805	$	20,132
Accounts payable and accrued liabilities:
Trade accounts payable	$	37,040	$	30,186
Drilling costs	16,116		30,948
Royalties	11,977		15,235
Production and franchise taxes	5,881		3,495
Compensation	4,827		5,186
Interest	6,208		5,964
Other	2,173		3,490
	$	84,222	$	94,504
Other liabilities:
Asset retirement obligations	$	6,440	$	6,283
Defined benefit pension obligations	1,694		1,763
Postretirement health care benefit obligations	3,011		3,022
Deferred compensation - SERP obligation and other	3,416		3,172
Other	2,014		1,647
	$	16,575	$	15,887