CONDENSED CONSOLIDATED BALANCE SHEET (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 180,307			$ 331,224		$ 243,075		$ 279,526
Restricted cash	177,647
Accounts receivable	173,775			171,971
Fair value of derivative contracts	16,635			4,549
Current income tax receivable	7,373			7,366
Deferred taxes	24,036	[1]		31,710	[1]
Inventory	3,709			3,723
Other current assets	1,884			1,874
Total current assets	585,366			552,417
Oil and gas properties, full cost method of accounting:
Proved	8,692,017			7,804,117
Less: accumulated depreciation, depletion and amortization	(6,568,551)			(5,908,760)
Net proved oil and gas properties	2,123,466			1,895,357
Unevaluated	570,658			724,339
Other property and equipment, net	32,118			26,178
Fair value of derivative contracts	6,481			1,378
Other assets, net	40,860			48,887
Total assets	3,358,949			3,248,556
Current liabilities:
Accounts payable to vendors	121,485			195,677
Undistributed oil and gas proceeds	58,503			37,029
Accrued interest	22,240			9,022
Fair value of derivative contracts	156			7,753
Asset retirement obligations	73,451			67,161
Other current liabilities	57,630			54,520
Total current liabilities	333,465			371,162
Long-term debt	1,037,440			1,027,084
Deferred taxes	394,846	[1]		390,693	[1]
Asset retirement obligations	336,197			435,352
Fair value of derivative contracts	24			470
Other long-term liabilities	41,350			53,509
Total liabilities	2,143,322			2,278,270
Commitments and contingencies
Stockholders' equity:
Common stock, $.01 par value; authorized 100,000,000 shares; issued 54,882,808 and 48,750,533 shares, respectively	549			488
Treasury stock (16,582 shares, at cost)	(860)			(860)
Additional paid-in capital	1,628,942			1,397,885
Accumulated deficit	(424,193)			(425,165)
Accumulated other comprehensive income (loss)	11,189		(18,200)	(2,062)		6,400	24,500	28,800
Total stockholders' equity	1,215,627			970,286
Total liabilities and stockholders' equity	$ 3,358,949			$ 3,248,556

[1] Deferred income taxes have been allocated to the Guarantor Subsidiary where related oil and gas properties reside.