CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share amounts) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 269	$ 282,248
Accounts receivable	304,175	318,371
Derivative asset	41,295	21,559
Deferred income taxes	9,084	10,749
Prepaid expense and other	16,782	14,574
Total current assets	371,605	647,501
Proved oil and gas properties	6,789,927	5,637,462
Less - accumulated depletion, depreciation, and amortization	(3,045,006)	(2,583,698)
Unproved oil and gas properties	536,100	271,100
Wells in progress	637,584	279,654
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $22,482 and $7,390, respectively	19,883	19,072
Other property and equipment, net of accumulated depreciation of $35,627 and $28,775, respectively	276,953	236,202
Total property and equipment, net	5,215,441	3,859,792
Derivative asset	22,510	30,951
Restricted cash	0	96,713
Other noncurrent assets	51,190	70,208
Total other noncurrent assets	73,700	197,872
Total Assets	5,660,746	4,705,165
Liabilities
Accounts payable and accrued expenses	664,925	606,751
Derivative liability	4,649	26,380
Other current liabilities	0	6,000
Total current liabilities	669,574	639,131
Revolving credit facility	390,000	0
Senior Notes (note 5)	1,600,000	1,600,000
Asset retirement obligation	123,905	115,659
Asset retirement obligation associated with oil and gas properties held for sale	452	3,033
Net Profits Plan liability	41,705	56,985
Deferred income taxes	846,698	650,125
Derivative liability	8,243	4,640
Other noncurrent liabilities	28,329	28,771
Total noncurrent liabilities	3,039,332	2,459,213
Commitments and contingencies (note 6)
Stockholders' equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued: 67,393,867 and 67,078,853 shares outstanding, respectively; net of treasury shares: 67,393,867 and 67,056,441, respectively	674	671
Additional paid-in-capital	273,783	257,720
Treasury stock, at cost: zero and 22,412 shares, respectively	0	(823)
Retained earnings	1,682,273	1,354,669
Accumulated other comprehensive loss	(4,890)	(5,416)
Total stockholders' equity	1,951,840	1,606,821
Total Liabilities and Stockholders' Equity	$ 5,660,746	$ 4,705,165