CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share amounts) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 51	$ 18
Accounts receivable	111,141	134,124
Derivative asset	281,596	367,710
Prepaid expenses and other	12,850	17,137
Total current assets	405,638	518,989
Proved oil and gas properties	6,994,150	7,606,405
Less - accumulated depletion, depreciation, and amortization	(3,385,234)	(3,481,836)
Unproved oil and gas properties	231,060	284,538
Wells in progress	466,403	387,432
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $288,592 and $0, respectively	152,725	641
Other property and equipment, net of accumulated depreciation of $34,699 and $32,956, respectively	144,675	153,100
Total property and equipment, net	4,603,779	4,950,280
Derivative asset	160,732	120,701
Other noncurrent assets	36,907	31,673
Total other noncurrent assets	197,639	152,374
Total Assets	5,207,056	5,621,643
Liabilities
Accounts payable and accrued expenses	293,796	302,517
Derivative liability	8,211	8
Other current liabilities	1,150	0
Total current liabilities	303,157	302,525
Revolving credit facility	293,000	202,000
Senior Notes, net of unamortized deferred financing costs (note 5)	2,271,472	2,315,970
Asset retirement obligation	105,329	137,284
Asset retirement obligation associated with oil and gas properties held for sale	33,862	241
Net Profits Plan liability	6,351	7,611
Deferred income taxes	563,105	758,279
Derivative liability	78,514	0
Other noncurrent liabilities	43,850	45,332
Total noncurrent liabilities	$ 3,395,483	$ 3,466,717
Commitments and contingencies (note 6)
Stockholders' equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding; 68,077,546 and 68,075,700, respectively	$ 681	$ 681
Additional paid-in-capital	312,473	305,607
Retained earnings	1,208,900	1,559,515
Accumulated other comprehensive loss	(13,638)	(13,402)
Total stockholders' equity	1,508,416	1,852,401
Total Liabilities and Stockholders' Equity	$ 5,207,056	$ 5,621,643