CONSOLIDATED BALANCE SHEET (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 74,488		$ 331,224		$ 279,526	$ 38,451
Restricted cash	177,647
Accounts receivable	120,359		171,971
Fair value of derivative contracts	139,179		4,549
Current income tax receivable	7,212		7,366
Deferred taxes			31,710	[1]
Inventory	3,709		3,723
Other current assets	8,118		1,874
Total current assets	530,712		552,417
Oil and gas properties, full cost method of accounting:
Proved	8,817,268		7,804,117
Less: accumulated depreciation, depletion and amortization	(6,970,631)		(5,908,760)
Net proved oil and gas properties	1,846,637		1,895,357
Unevaluated	567,365		724,339
Other property and equipment, net of accumulated depreciation of $24,091 and $21,748, respectively	32,340		26,178
Fair value of derivative contracts	14,333		1,378
Other assets, net of accumulated depreciation and amortization of $8,478 and $5,768, respectively	27,224		48,887
Total assets	3,018,611		3,248,556
Current liabilities:
Accounts payable to vendors	132,629		195,677
Undistributed oil and gas proceeds	23,232		37,029
Accrued interest	9,022		9,022
Deferred taxes	20,119	[1]
Fair value of derivative contracts			7,753
Asset retirement obligations	69,400		67,161
Other current liabilities	49,505		54,520
Total current liabilities	303,907		371,162
Long-term debt	1,041,035		1,027,084
Deferred taxes	286,343	[1]	390,693	[1]
Asset retirement obligations	247,009		435,352
Fair value of derivative contracts			470
Other long-term liabilities	38,714		53,509
Total liabilities	1,917,008		2,278,270
Commitments and contingencies
Stockholders' equity:
Common stock, $.01 par value; authorized 100,000,000 shares; issued 54,884,542 and 48,750,533 shares, respectively	549		488
Treasury stock (16,582 shares, at cost)	(860)		(860)
Additional paid-in capital	1,633,307		1,397,885
Accumulated deficit	(614,708)		(425,165)
Accumulated other comprehensive income (loss)	83,315		(2,062)		28,833
Total stockholders' equity	1,101,603		970,286
Total liabilities and stockholders' equity	$ 3,018,611		$ 3,248,556

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