Additional Balance Sheet Detail (Tables)

9 Months Ended

Sep. 30, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Components of Selected Balance Sheet Accounts

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

	As of
	September 30,		December 31,
	2013		2012
Other current assets:
Tubular inventory and well materials	$	2,413	$	4,033
Prepaid expenses	2,764		562
	$	5,177	$	4,595
Other assets:
Debt issuance costs	$	30,802	$	13,186
Assets of supplemental employee retirement plan (“SERP”)	3,537		3,237
Other	4,233		1,511
	$	38,572	$	17,934
Accounts payable and accrued liabilities:
Trade accounts payable	$	79,878	$	37,835
Drilling and other lease operating costs	44,537		37,703
Royalties	33,917		14,390
Production and franchise taxes	11,542		2,874
Compensation - related	6,164		6,853
Interest	38,816		5,828
Preferred stock dividends	1,725		1,687
Other	6,500		4,485
	$	223,079	$	111,655
Other liabilities:
Firm transportation obligation	$	13,525	$	14,333
Asset retirement obligations (“AROs”)	6,301		4,513
Defined benefit pension obligations	1,718		1,821
Postretirement health care benefit obligations	2,825		2,634
Deferred compensation - SERP obligation and other	3,644		3,310
Other	4,454		2,290
	$	32,467	$	28,901