Condensed Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 15,999	$ 86,367
Accounts receivable	45,100	46,975
Deferred tax assets	4,826	6,347
Other current assets	10,712	18,105
Assets held for sale	0	564
Total Current Assets	76,637	158,358
Property and Equipment:
Property and Equipment	4,376,222	3,951,107
Less - Accumulated depreciation, depletion, and amortization	(2,540,613)	(2,378,262)
Property and Equipment, Net	1,835,609	1,572,845
Other Long-Term Assets	12,222	12,713
Total Assets	1,924,468	1,743,916
Current Liabilities:
Accounts payable and accrued liabilities	90,751	75,594
Accrued capital costs	82,593	64,879
Accrued interest	10,223	11,010
Undistributed oil and gas revenues	4,010	5,252
Total Current Liabilities	187,577	156,735
Long-Term Debt	471,809	471,624
Deferred Income Taxes	192,131	157,565
Asset Retirement Obligation	91,237	70,171
Other Long-Term Liabilities	10,221	7,804
Commitments and Contingencies
Stockholders' Equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized, none outstanding
Common stock, $.01 par value, 150,000,000 shares authorized, 42,955,730 and 42,440,583 shares issued, and 42,473,911 and 41,999,058 shares outstanding, respectively	430	424
Additional paid-in capital	722,502	706,857
Treasury stock held, at cost, 481,819 and 441,525 shares, respectively	(12,276)	(9,778)
Retained earnings	260,837	182,652
Accumulated other comprehensive income (loss), net of income tax	0	(138)
Total Stockholders' Equity	971,493	880,017
Total Liabilities and Stockholders' Equity	$ 1,924,468	$ 1,743,916