8. Additional Balance Sheet Detail

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

	September 30,		December 31,
	2011		2010
Other current assets:
Tubular inventory and well materials	$	3,969	$	3,600
Prepaid expenses		237		633
	$	4,206	$	4,233
Other assets:
Debt issuance costs	$	17,660	$	14,300
Long-term investments - SERP		3,674		6,440
Other		49		47
	$	21,383	$	20,787
Accounts payable and accrued liabilities:
Trade accounts payable	$	25,202	$	33,831
Drilling costs		25,285		31,770
Royalties		13,140		9,308
Production and franchise taxes		5,146		6,012
Compensation		6,947		9,631
Interest		19,319		2,977
Other		3,264		6,132
	$	98,303	$	99,661
Other liabilities:
Asset retirement obligations	$	6,019	$	7,364
Pension		1,666		1,766
Postretirement health care		2,966		2,976
Deferred compensation		3,806		6,952
Other		1,200		900
	$	15,657	$	19,958