CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share amounts) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 82	$ 120
Accounts receivable	239,983	322,630
Derivative asset	269,022	402,668
Prepaid expenses and other	16,621	19,625
Total current assets	525,708	745,043
Proved Oil and Gas Properties	7,356,877	7,348,436
Less - accumulated depletion, depreciation, and amortization	(3,073,603)	(3,233,012)
Unproved Oil and Gas Properties	419,903	532,498
Wells in progress	419,979	503,734
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $30,514 and $22,482, respectively	7,361	17,891
Other property and equipment, net of accumulated depreciation of $38,051 and $37,079, respectively	354,528	334,356
Total property and equipment, net	5,485,045	5,503,903
Derivative asset	131,464	189,540
Other noncurrent assets	71,401	78,214
Total other noncurrent assets	202,865	267,754
Total Assets	6,213,618	6,516,700
Liabilities
Accounts payable and accrued expenses	423,536	640,684
Derivative liability, current	8,107	0
Deferred tax liability	90,514	142,976
Other current liabilities	0	1,000
Total current liabilities	522,157	784,660
Revolving credit facility	122,000	166,000
Senior Notes (note 5)	2,350,000	2,200,000
Asset retirement obligation	115,276	120,867
Net Profits Plan liability	18,326	27,136
Deferred income taxes	859,588	891,681
Derivative liability	1,026	70
Other noncurrent liabilities	36,938	39,631
Total noncurrent liabilities	$ 3,503,154	$ 3,445,385
Commitments and contingencies (note 6)
Stockholders' equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding; 67,598,649 and 67,463,060, respectively	$ 676	$ 675
Additional paid-in-capital	299,637	283,295
Retained earnings	1,900,058	2,013,997
Accumulated other comprehensive loss	(12,064)	(11,312)
Total stockholders' equity	2,188,307	2,286,655
Total Liabilities and Stockholders' Equity	$ 6,213,618	$ 6,516,700