CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share amounts) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 197	$ 120
Accounts receivable	171,067	322,630
Derivative asset	347,299	402,668
Prepaid expenses and other	19,114	19,625
Total current assets	537,677	745,043
Proved Oil and Gas Properties	7,468,331	7,348,436
Less - accumulated depletion, depreciation, and amortization	(3,240,109)	(3,233,012)
Unproved Oil and Gas Properties	381,869	532,498
Wells in progress	452,436	503,734
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $74,894 and $22,482, respectively	29,173	17,891
Other property and equipment, net of accumulated depreciation of $43,197 and $37,079, respectively	359,339	334,356
Total property and equipment, net	5,451,039	5,503,903
Derivative asset	147,530	189,540
Other noncurrent assets	77,615	78,214
Total other noncurrent assets	225,145	267,754
Total Assets	6,213,861	6,516,700
Liabilities
Accounts payable and accrued expenses	361,734	640,684
Derivative liability	2,900	0
Deferred tax liability	120,563	142,976
Other current liabilities	0	1,000
Total current liabilities	485,197	784,660
Revolving credit facility	184,000	166,000
Senior Notes (note 5)	2,350,000	2,200,000
Asset retirement obligation	118,153	120,867
Net Profits Plan liability	13,962	27,136
Deferred income taxes	833,352	891,681
Derivative liability	2,019	70
Other noncurrent liabilities	40,341	39,631
Total noncurrent liabilities	$ 3,541,827	$ 3,445,385
Commitments and contingencies (note 6)
Stockholders' equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding; 67,968,714 and 67,463,060, respectively	$ 680	$ 675
Additional paid-in-capital	298,438	283,295
Retained earnings	1,899,803	2,013,997
Accumulated other comprehensive loss	(12,084)	(11,312)
Total stockholders' equity	2,186,837	2,286,655
Total Liabilities and Stockholders' Equity	$ 6,213,861	$ 6,516,700