CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share amounts) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 18	$ 18
Accounts receivable	143,979	134,124
Derivative asset	145,576	367,710
Prepaid expenses and other	14,901	17,137
Total current assets	304,474	518,989
Proved oil and gas properties	7,249,808	7,606,405
Less - accumulated depletion, depreciation, and amortization	(3,606,829)	(3,481,836)
Unproved oil and gas properties	222,967	284,538
Wells in progress	415,973	387,432
Oil and gas properties held for sale, net	173,001	641
Other property and equipment, net of accumulated depreciation of $38,175 and $32,956, respectively	146,412	153,100
Total property and equipment, net	4,601,332	4,950,280
Derivative asset	113,119	120,701
Other noncurrent assets	25,550	31,673
Total other noncurrent assets	138,669	152,374
Total Assets	5,044,475	5,621,643
Liabilities
Accounts payable and accrued expenses	257,349	302,517
Derivative liability	63,492	8
Total current liabilities	320,841	302,525
Revolving credit facility	330,500	202,000
Senior Notes, net of unamortized deferred financing costs (note 5)	2,272,580	2,315,970
Asset retirement obligation	108,331	137,284
Asset retirement obligation associated with oil and gas properties held for sale	32,055	241
Net Profits Plan liability	9,476	7,611
Deferred income taxes	472,355	758,279
Derivative liability	104,660	0
Other noncurrent liabilities	44,841	45,332
Total noncurrent liabilities	3,374,798	3,466,717
Commitments and contingencies (note 6)
Stockholders' equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding; 68,274,551 and 68,075,700, respectively	683	681
Additional paid-in-capital	321,841	305,607
Retained earnings	1,040,219	1,559,515
Accumulated other comprehensive loss	(13,907)	(13,402)
Total stockholders' equity	1,348,836	1,852,401
Total Liabilities and Stockholders' Equity	$ 5,044,475	$ 5,621,643