CONSOLIDATED BALANCE SHEET (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 279,526		$ 38,451
Accounts receivable	167,288		118,139
Fair value of hedging contracts	39,655		25,177
Current income tax receivable	10,027		19,946
Deferred taxes	15,514	[1]	26,072	[1]
Inventory	4,207		4,643
Other current assets	3,626		791
Total current assets	519,843		233,219
Oil and gas properties, full cost method of accounting:
Proved	7,244,466		6,648,168
Less: accumulated depreciation, depletion and amortization	(5,510,166)		(5,174,729)
Net capitalized costs, proved and unevaluated	1,734,300		1,473,439
Unevaluated	447,795		401,609
Other property and equipment, net of accumulated depreciation of $26,429 and $24,263, respectively	22,115		11,172
Fair value of hedging contracts	9,199		22,543
Other assets, net of accumulated depreciation and amortization of $6,438 and $5,911, respectively	43,179		23,769
Total assets	2,776,431		2,165,751
Current liabilities:
Accounts payable to vendors	94,361		102,946
Undistributed oil and gas proceeds	23,414		27,328
Accrued interest	18,546		14,059
Fair value of hedging contracts	149		11,122
Asset retirement obligations	66,260		62,676
Other current liabilities	16,765		28,370
Total current liabilities	219,495		246,501
Long-term debt	914,126		620,000
Deferred taxes	310,830	[1]	247,835	[1]
Asset retirement obligations	422,042		363,103
Fair value of hedging contracts	1,530		815
Other long-term liabilities	36,275		19,668
Total liabilities	1,904,298		1,497,922
Commitments and contingencies
Stockholders' equity:
Common stock, $.01 par value; authorized 100,000,000 shares; issued 48,392,552 and 48,076,860 shares, respectively	484		481
Treasury stock (16,582 shares, at cost)	(860)		(860)
Additional paid-in capital	1,386,475		1,338,565
Accumulated deficit	(542,799)		(692,225)
Accumulated other comprehensive income	28,833		21,868
Total stockholders' equity	872,133		667,829
Total liabilities and stockholders' equity	$ 2,776,431		$ 2,165,751

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