The following tables summarize components of selected balance sheet accounts as of the periods presented:

	June 30,		December 31,
	2011		2010
Other current assets:
Tubular inventory and well materials	$	2,256	$	3,600
Prepaid expenses		1,648		633
	$	3,904	$	4,233
Other assets:
Debt issuance costs	$	16,749	$	14,300
Long-term investments - SERP		5,363		6,440
Other		46		47
	$	22,158	$	20,787
Accounts payable and accrued liabilities:
Trade accounts payable	$	34,493	$	33,831
Drilling costs		24,052		31,770
Royalties		10,413		9,308
Production and franchise taxes		4,593		6,012
Compensation		5,100		9,631
Interest		6,241		2,977
Other		4,432		6,132
	$	89,324	$	99,661
Other liabilities:
Asset retirement obligation	$	7,312	$	7,364
Pension		1,700		1,766
Postretirement health care		2,978		2,976
Deferred compensation		5,688		6,952
Other		900		900
	$	18,578	$	19,958